Expanding U.S. Energy Self-Sufficiency and Diminishing Gulf Security Commitments: Strategic Implications for West Asia and South Korea's Response

Executive Summary

The reduction of U.S. security commitments in the Gulf is a consequence not only of President Trump's personal negotiating style or his vision for an Israel-centric regional order, but also of the structural shift since 2008 toward expanded shale production and the U.S. transition to a net energy exporter. Although the war that began in February 2026 ended early with the Islamabad Memorandum in June, the memorandum's expiration on August 17 has led the United States and Iran to resume their dispute over the facts of passage through the Strait of Hormuz, with Brent crude fluctuating between $88 and $95 per barrel. As Vice President Vance has indicated, the priority of U.S. policy toward Iran has shifted from regime change and the dismantlement of nuclear facilities to stabilizing consumer oil prices. This suggests Washington is moving away from its long-standing practice of providing the public good of protecting Gulf sea lanes free of charge. This structural change is likely to persist regardless of any change in administration, necessitating that South Korea redesign its response framework around three pillars: monitoring its exposure to the circumvention of sanctions on Iranian crude oil, diversifying its procurement sources, and decoupling its response to U.S. demands for security contributions from its response to calls for sanctions enforcement.

I. Analysis of the Current Situation

Expanding U.S. Energy Self-Sufficiency and Weakening Gulf Energy Dependence: Strategic Implications for West Asia—An Analysis of the Current Situation

1. Background and Developments

The U.S. shale revolution has increased total oil production more than fourfold since 2008. In the process, the United States transitioned from a net energy importer to a net exporter. EAI Professor Lee Wang-hwi has pointed out that this transition was predicted as early as 2020 [8]. At the time, this analysis was based on an optimistic view that the energy supply and demand structures of the U.S. and China were complementary. However, following the intensification of the trade war, assessments concluded that the U.S.-China relationship in the energy sector had shifted from "win-win" to "zero-sum" [8].

This structural change has eroded the rationale for U.S. security commitments to the Gulf region. The Council on Foreign Relations (CFR) notes that two lines of argument have long been present in the United States. One is that the U.S., no longer dependent on Middle Eastern energy, can withdraw from the region. The other is that protecting Gulf oil fields has become unnecessary as the transition to alternative energy sources progresses [3]. While the CFR assesses both arguments as "rather simplistically" reasoned, it does not deny that this perception has been a real factor in Washington policy circles [3].

On February 28, 2026, the United States and Israel launched airstrikes on targets inside Iran, initiating a full-scale war in the Middle East [5][10]. After the war began, the Strait of Hormuz was effectively blockaded. Before the war, this strait was a route for about one-fifth of the world's crude oil and LNG supply [1][5][10]. According to data from the Peterson Institute for International Economics (PIIE), an average of 88 merchant ships passed through the strait daily [10]. On June 17, President Trump and the Tehran government signed a memorandum of understanding known as the "Islamabad Memorandum." It stipulated an immediate and permanent cessation of military actions on all fronts [5]. The general consensus in Washington is that this decision for an early end to the war was driven by domestic inflationary pressures and the midterm election schedule.

2. Current Situation

The Islamabad Memorandum expired on August 17. With the technical termination of this agreement, which had set a 60-day negotiation deadline, the U.S. and Iran have re-entered a phase of disputing the facts on the ground [5][10][17]. On August 18, President Trump stated that there were no ongoing or scheduled negotiations with Iran. He claimed the Strait of Hormuz was open. This directly contradicts Iran's claim that the strait remains blockaded [14][16]. President Trump later declared he would not attempt to revive the expired ceasefire agreement. When asked on August 17 whether the memorandum would be extended, he answered "no" [17].

Iran signaled it would not capitulate by attacking a UAE vessel [5]. On August 19, the UAE issued a missile alert. Immediately after this incident, Brent crude approached $92 per barrel [9]. On August 20, Brent crude rose to $94.06 [5]. The U.S. announced new sanctions against Iran on August 24 [10]. However, given that China accounts for over 80% of Iran's crude oil imports, Beijing has little incentive to abandon this arrangement [10]. EAI assesses that the actual enforcement of sanctions is likely to be selective and phased [10].

The market is showing an interesting asymmetry. *Foreign Affairs* assesses that while the world should be experiencing a much more severe energy crisis, oil prices have remained low compared to the worst-case scenarios feared at the war's outset, and the natural gas market has also shown resilience [1]. *Gulf News* specifies the mechanism behind this buffer. It reports that about 80% of oil tankers passing through the Strait of Hormuz are sailing "dark" by turning off their location signals, then turning them back on after transit, allowing crude oil to continue flowing under de facto U.S. protection [7]. The U.S. Energy Information Administration (EIA) also raised its global oil production forecast after the Strait of Hormuz was opened [6]. This unilateral transit practice by Iran has become a de facto standard, but its unstable legal status means the risk of an abrupt halt to shipping remains [10].

Meanwhile, a survey in the U.S. found that rising oil and gasoline prices are changing daily life patterns. The survey reported that many Americans are responding by driving less and consolidating trips [18]. This aligns with the context of the Trump administration continuously lowering its war aims. *Foreign Policy* reports that as the conflict, initially expected to be a "six-week war," entered its sixth month, Vice President Vance presented a new war aim. This was that lowering energy prices for American consumers is "goal No. 1" [11]. This framing represents a significant retreat from the initial goals of regime change or the complete elimination of nuclear facilities.

3. Key Actors and Positions

The Trump Administrationhas reset low oil prices as the top priority of its economic war against Iran [5][11]. Vice President Vance's statement can be read as formalizing this reset [11]. However, a hardline stance also coexists within the administration. Treasury Secretary Besant warned of "never before seen" measures against countries that support or trade with Iran [4]. President Trump himself has repeatedly threatened economic sanctions against Iran and Oman via social media [4]. This dual approach reveals the tension between the political demand for stable domestic oil prices and the hardline foreign policy of maintaining maximum pressure on Iran.

Iranis using its de facto control over the Strait of Hormuz as negotiating leverage. After the memorandum's expiration, Iran directly contradicted the U.S. declaration that the strait was open, insisting it remains blockaded [14][16]. By attacking a UAE vessel, it is simultaneously signaling its refusal to fully capitulate [5]. This can be interpreted as a dual strategy to pressure for a resumption of negotiations while also demonstrating its military deterrent capabilities.

Gulf Statesare bearing the tangible risks on the front lines of this stalemate. The UAE was exposed to a direct security threat when it issued a missile alert [9]. The Gulf-based media outlet *Gulf News* highlights that the U.S. is de facto guaranteeing passage through the strait via the "dark tanker" practice [7]. This suggests the U.S. is taking a compromise approach, seeking to maintain market stability without explicit military intervention.

ChinaAs the largest importer of Iranian crude oil, China is the actor with the greatest stake in the new phase of U.S. sanctions. Since it has no incentive to abandon a structure where it imports over 80% of Iranian crude, U.S. sanctions against Iran face fundamental limitations in their effectiveness [10]. *Mint* notes that Trump's threats against Iran have direct repercussions for China and India, pointing out that this dynamic is an extension of U.S.-China energy competition [4].

Asian Energy Importers (including South Korea and Japan)are exposed to risks within a structure that relies on Iran's unilateral transit system. EAI analysis points out that the real pressure on these countries stems not from the sanctions themselves, but from the possibility that demands to join sanctions against Iran will be linked as a package with demands for military contributions in the Strait of Hormuz [10]. This suggests a structural incentive for the U.S. to shift the burden of protecting sea lanes to energy-importing countries.

4. Key Issues

The first issue is whether the limits of U.S. strategic patience stem purely from political factors (midterm elections, public opinion) or from the structural factor of energy self-sufficiency. Vice President Vance's statement resetting "goal No. 1" lends weight to the latter interpretation [11]. It suggests that in a situation where the U.S. no longer directly depends on Middle Eastern crude oil, the political goal of managing domestic oil prices is overriding geopolitical objectives.

The second issue is the legal vacuum in the transit regime for the Strait of Hormuz. Although Iran's practice of unilaterally permitting passage has become a de facto standard, this system lacks a legal basis [10]. The "dark tanker" practice is merely a stopgap measure to bring market stability, not a stable institution [7]. This instability remains a potential risk that could lead to an abrupt halt in shipping at any time.

The third issue is the possibility that the U.S. strategy of burden-shifting will apply to allies and competitors alike. *Foreign Policy* criticizes the Trump administration for simultaneously damaging key relationships in both East Asia and the Middle East. This contrasts with the Obama administration's original "pivot to Asia" strategy, which envisioned reducing security commitments in the Middle East to focus on the Indo-Pacific [15]. The current situation is leading to assessments that while the goal of reducing the Middle East security burden remains, the benefits of this reduction have not been stably transferred to any specific region, resulting in a loss of trust on both fronts.

The fourth issue is that China's dependence on Iranian crude oil fundamentally limits the effectiveness of U.S. sanctions. This creates a paradox where the country to which the U.S. seeks to shift burdens (China) simultaneously holds the key to evading sanctions [4][10]. For energy importers, including South Korea, maintaining strategic ambiguity by refraining from preemptively declaring participation in this sanctions-military contribution linkage has emerged as an immediate challenge [10].

II. In-Depth Analysis

Expanding U.S. Energy Self-Sufficiency and Weakening Gulf Energy Dependence: Strategic Implications for West Asia—An In-Depth Analysis

1. Root Cause: A Recalculation of Interests Driven by the Reversal in Energy Status

The incentive for the U.S. to reduce its security commitments in the Gulf did not emerge suddenly. Its roots trace back to the period after 2008 when shale production increased U.S. total oil output more than fourfold [8]. Professor Lee Wang-hwi points out that by 2020, the prospect of the U.S. becoming a net energy exporter was already established within policy circles [8]. As this prospect became a reality, two lines of policy logic formed in Washington. According to the CFR's summary, one was the argument that "the United States, no longer dependent on Middle Eastern energy resources, can withdraw from the region" [3]. The other was that as the transition to alternative energy progresses, "the need to protect the region's oil fields has itself disappeared" [3]. Although the CFR assesses these two lines of reasoning as "rather simplistically" argued [3], it is difficult to conclude that this simplified logic has been completely discarded in the actual policymaking process.

The decision to end the recent war early is a case study in the consequences of this structural logic combining with political pressure. The signing of the Islamabad Memorandum on June 17 was the result of the Trump administration scaling back its war aims after a conflict planned for six weeks showed signs of lasting much longer [11]. *Foreign Policy* describes this as the Trump administration "steadily lowering its war aims as the war enters its sixth month" [11]. The new goal presented by Vice President Vance was not regime change in Iran or the complete dismantlement of its nuclear facilities. The statement that "lowering energy prices for American consumers is goal No. 1" summarizes this shift [11]. This signifies that the axis of U.S. policy toward Iran has shifted from geopolitical objectives to domestic price management. It is paradoxical that even in the United States, now a net energy exporter, soaring oil prices directly impact consumer prices. However, this very paradox explains why U.S. strategic patience has shortened. Net exporter status has reduced physical dependence on Gulf crude itself, but it has not eliminated the U.S. economy's sensitivity to global oil price benchmarks.

2. Structural Context: Three Layers of Constraints

Political Structure: The Midterm Election Clock and Public Opinion

According to a survey reported by *Daily Sabah*, soaring oil prices are already changing the daily consumption patterns of Americans. The number of households responding by driving less and consolidating trips has increased [18]. For the Trump administration, this means the domestic political clock ticks much faster than the clock for achieving military objectives in the Gulf. Ahead of the midterm elections, oil prices and inflation figures are variables that immediately affect the administration's approval ratings. In contrast, goals like dismantling Iran's nuclear capabilities or regime change are time-consuming and may not yield visible results. When two goals with different political discount rates conflict, it was structurally predetermined which one an elected president with a fixed term would prioritize.

Economic Structure: The Pitfall of Net Exporter Status

The fact that the U.S. has become a net exporter theoretically mitigates the net effect of rising oil prices on the U.S. economy. This is because producer surplus can offset the burden on consumers. However, the actual political reaction operates independently of this net effect calculation. Voters react to the prices at the gas pump, not to the nation's overall net export statistics. This asymmetry is the factor that led the Trump administration to set lower oil prices as the top priority of its Iran policy, despite its net exporter status [5]. When Brent crude soared to $94.06 per barrel on August 20 [5], market observers such as Standard Chartered noted on August 21 that U.S. Treasury yields had hit a multi-year high. This signifies a secondary spillover effect, where fears of oil-driven inflation drive up fiscal financing costs [16].

Security Structure: Asymmetrical Interests Surrounding Hormuz

The Strait of Hormuz is a route for about one-fifth of the world's crude oil and LNG supply [1][5][10]. However, the composition of final destinations for this transit volume has fundamentally changed over the past 15 years. China's imports account for over 80% of Iran's crude oil exports [10]. This means that China and other Asian consumer nations, not the United States, now have a much more direct stake in the stability of Hormuz. According to *Gulf News*, it is observed that shipments bypassing the strait via the "dark tanker" method, protected by the U.S., account for 80% of total traffic [7]. While this means the U.S. is still engaged in substantive military intervention to stabilize the strait, it also reveals an asymmetry: the beneficiaries of this intervention are not the U.S. itself, but Asian energy importers. This asymmetry is at the core of the Trump administration's incentive to distribute the burden of protecting Gulf sea lanes to both allies and competitors.

3. Historical Precedent: Continuity with Obama's 'Pivot to Asia'

The recent early end to the war and the subsequent stalemate are not entirely new phenomena. *Foreign Policy* recalls the "pivot to Asia" concept from the first term of the Obama administration in 2011. The core objective of that strategy was to "gradually reduce the costly, decades-long security commitments in the Middle East to reallocate resources to the region expected to pose the most difficult future challenges"—namely, the Indo-Pacific [15]. The general consensus in Washington's diplomatic circles is that while this concept has been repeatedly reaffirmed across Republican and Democratic administrations, its actual implementation has consistently been delayed by crises originating in the Middle East. The recent Iran war is following a similar pattern. *Foreign Policy* criticizes the Trump administration for having "simultaneously wrecked key relationships in both East Asia and the Middle East," framing the current situation as another instance of the repeated frustration of the 'pivot to Asia' [15]. However, what distinguishes this case from the past is that this renewed attempt at a pivot has been frustrated at a time when U.S. energy self-sufficiency is actually much higher than it was during the Obama era. In other words, the unique feature of the current phase is that although the structural condition of energy self-sufficiency has been met, it has failed to translate into an actual reallocation of policy priorities.

Another precedent is the changing nature of the U.S.-China energy relationship. As professors Lee Seung-joo and Shin Beom-shik, among others, have pointed out, until the late 2010s, the U.S.-China energy relationship was based on the optimistic premise of being "complementary" [8][12]. However, after the intensification of the trade war, the nature of this relationship changed "from a win-win game to a zero-sum game" [8]. Professor Shin Beom-shik noted that "security tensions are rising over the issue of securing energy transport routes" and specifically pointed to the potential for new energy technologies to become a battleground for long-term strategic competition [12]. The current Hormuz situation is an example of this prediction materializing even at the level of traditional energy transport routes. Given that the countries the U.S. seeks to share the costs of stabilizing the strait with must include not only allies but also China, the likelihood has grown that energy security issues will function as a new lever in U.S.-China competition.

4. Key Variables Shaping Future Developments

Variable 1: China's Dependence on Iranian Crude and its Willingness to Enforce Sanctions

The effectiveness of the new sanctions against Iran announced by the U.S. on August 24 depends entirely on China's stance. China, which accounts for over 80% of Iran's crude oil imports, has little incentive to abandon this arrangement [10]. Therefore, the prevailing view at present is that sanctions are "likely to be implemented selectively and in phases" [10]. This variable is the dividing line that will determine whether U.S. pressure on Iran can have a real blocking effect or will remain merely a symbolic measure.

Variable 2: The Sustainability of the 'Dark Tanker' Bypass System

The observation that 80% of Hormuz transit is conducted via the "dark tanker" method [7] reveals the gap between the official blockade and the actual flow of goods. As long as this bypass system remains stable, a surge in oil prices can be avoided. However, this system is an informal arrangement predicated on U.S. acquiescence or cooperation. A potential risk is that the U.S. attitude toward this bypass system could change at any time if the Trump administration pivots toward intensifying pressure on Iran.

Variable 3: The Trump Administration's Domestic Political Clock

Vice President Vance's statement that "lowering energy prices is goal No. 1" [11] is a litmus test for the future direction of policy. As the midterm elections approach, there is a greater possibility of short-term compromises to stabilize oil prices (e.g., conciliatory signals toward Iran, sanctions relief). Conversely, if oil prices surge again and inflationary pressure mounts, the possibility of military options re-emerging cannot be ruled out. President Trump's declaration on August 18 that there were "no scheduled negotiations with Iran" [14][16], while simultaneously claiming the strait was "open" [14][16], can be read as an attempt to maintain political ambiguity between these two pressures.

Variable 4: The Acceptance of Attempts to Shift Burdens to Allies and Competitors

The U.S. attempt to distribute the costs of protecting Gulf sea lanes among Asian energy importers like South Korea, Japan, and China is already structurally foreseeable. The question is to what extent each country will accept this attempt at cost-sharing. In South Korea's case, the "possibility that demands to join Iran sanctions will be linked as a package with demands for military contributions in Hormuz" is identified as a key pressure point [10]. Whether it can respond to these two demands separately will determine the scope of South Korea's policy discretion going forward.