North Korea’s Warning of 'Collective Punishment' and the Debate over South Korea’s Integration into the US-ROK Collective Defense System: Situation Analysis and Countermeasures

Executive Summary

Kang Chol-su, director of North Korea’s Enemy Research Institute, targeted USFK Commander Xavier Brunson’s remark labeling South Korea as the 'decisive center of collective defense' by defining South Korea as the 'decisive target of collective punishment.' As an extension of the 'hostile two-state theory' finalized at the end of 2023, this logic reframes the expansion of the US-ROK alliance's regional defense function as a pretext for attacking South Korea. Although low-intensity military actions—such as the range upgrade of 240mm rocket launchers and landmine explosions in the DMZ—accompanied the statement, the United States maintained a restrained stance, focusing on reaffirming its defense commitment rather than defining the actions as provocations. Regarding future developments, the most likely path is one where low-intensity threats recur constantly while the dual-track approach of a hardline stance toward South Korea and a conciliatory stance toward the US is maintained (55% probability); however, the possibility of escalation into localized use of force (25%) cannot be ruled out. The South Korean government needs to establish an interagency narrative management system and preemptively draw a line between expanding South Korea's role in Indo-Pacific collective defense and concerns over entanglement in out-of-area conflicts.

I. Situation Analysis

North Korea Warns of 'Collective Punishment' in Response to USFK Commander's Remarks: Situation Analysis

1. Background and Progress of the Issue

North Korea’s policy toward South Korea had already undergone a fundamental shift starting from the end of 2023. At the Ninth Plenary Meeting of the Eighth Central Committee of the Workers’ Party of Korea (WPK) in December 2023, Kim Jong Un defined inter-Korean relations as "relations between two hostile states, two belligerents at war" [3]. In his policy speech at the Supreme People’s Assembly in January 2024, he stated that in the event of war, North Korea would "completely occupy, subjugate, and reclaim the Republic of Korea" [3]. This policy is premised on discarding the unification-oriented discourse of sharing the same ethnicity and treating South Korea as a separate, hostile state [3].

In his policy speech in March 2026, Kim Jong Un reaffirmed South Korea as "officially recognized as the most hostile state" and vowed to "make it pay a merciless price" [3]. At the end of July of the same year, Kim Yo Jong, vice department director of the WPK Central Committee, declared that North Korea would "not establish relations with South Korea in any form" [3]. However, during this period, messages directed at the US maintained a dual attitude, leaving open the possibility of conditional dialogue [3]. This indicates that a dual-track strategy—a hardline stance toward South Korea and a conciliatory stance toward the US—had already been established.

Amid this trend, on September 25, Kang Chol-su, director of North Korea’s Enemy Research Institute, issued a new statement through the Korean Central News Agency (KCNA) [1][4]. The statement targeted USFK Commander Xavier Brunson’s remarks at the Korea-US International Security Conference in Seoul, where he stated that "the security of the Korean Peninsula is directly linked to the stability of Northeast Asia, the Western Hemisphere, and the entire Pacific region," and referred to South Korea as the "decisive center of collective defense" [4]. Kang defined this as "the gangster-like nature of the United States, which seeks to utilize South Korea as a core base for executing its hegemony strategy and as a mercenary in regional conflicts," and asserted that "South Korea, which has emerged as the 'decisive center of collective defense,' will become the decisive target of collective punishment" [4].

2. Current Situation

Around the time the statement was released, signs emerged that tensions in the border region were shifting beyond rhetoric into a physical phase. Short-range ballistic missile launches, landmine explosions in the DMZ, and range upgrade tests for 240mm multiple rocket launchers (MRLs) were concentrated during the same period [3]. Regarding the 240mm rocket launcher upgrade, North Korea announced that it had extended the range to 100 km for direct fire and 115 km in gliding-composite mode, explicitly stating that deploying them along the southern border area was aimed at "keeping the enemy in constant anxiety and terror" [13]. In the DMZ, an explosion suspected to be a landmine occurred on the western front on September 21. The Joint Chiefs of Staff (JCS) explained this as an accident that occurred during an operation to clear search paths to identify suspected landmine areas laid by the North Korean military across the Military Demarcation Line (MDL) [15].

The US response maintained a restrained tone, focusing on reaffirming its defense commitment rather than defining the actions as provocations [6]. This pattern was also observed during the short-range ballistic missile launches around Wonsan in August. Even then, reports from Washington indicated that the US side emphasized confirming its alliance commitment over condemning the provocations [6]. Separately, a spokesperson for North Korea’s Ministry of National Defence warned that strengthening US-ROK cooperation in responding to weapons of mass destruction (WMD) could trigger its nuclear response [7]. The structure in which messages to the US and South Korea are operated through separate channels is being maintained in this statement as well.

South Korea's newly appointed Minister of National Defense responded by demanding that North Korea halt the fortification of the border area [10]. However, this demand has not led to a counter-narrative against the 'logic of integration into US-ROK collective defense' targeted by Kang Chol-su's statement.

3. Key Actors and Positions

North Korea operates separate channels for different targets, including the Enemy Research Institute, the spokesperson for the Ministry of National Defence, and Kim Yo Jong. The core of Kang Chol-su's statement is reframing the logic of the US-ROK alliance's integration into regional strategic structures as a pretext for attack [3][4]. Around the same time, Kim Yo Jong defined the US-ROK-Japan multilateral exercises as a "tripartite threat" and warned of a "more offensive" response [9]. Kim Kang Il, North Korea's vice chief of the general staff, reaffirmed the "irreversibility" of its nuclear policy at the Beijing Xiangshan Forum and mentioned strengthening military cooperation with China [11]. Three tracks—a hardline stance toward South Korea, the possibility of conditional dialogue with the US, and close alignment with China—are being operated simultaneously.

The United States explicitly positioned South Korea’s strategic status within the Indo-Pacific collective defense system through the USFK commander's remarks. This signal provided North Korea with a pretext for attack, while also serving to manage the credibility of extended deterrence. In response to North Korea's backlash, the US side maintains a restrained stance, focusing on reaffirming its defense commitment rather than defining the actions as provocations [6]. However, as out-of-area demands from the US, such as pressure to dispatch troops to the Strait of Hormuz, overlap, South Korea's dilemma regarding military force allocation is emerging as a separate issue [14].

South Korea responded through its newly appointed Minister of National Defense demanding a halt to the fortification of the border area [10], but a direct counter-narrative against the 'logic of integration into collective defense' targeted by Kang Chol-su's statement has not yet clearly emerged. Physical risks in the border area (landmines, rocket range extension) and discourse risks (the mercenary theory, the collective punishment theory) have simultaneously emerged as targets for management.

4. Key Issues

First, it is important to note that Kang Chol-su's statement targeted the logic of integration implied by Commander Brunson's remarks rather than the remarks themselves [3]. Defining South Korea as the 'decisive center of collective defense' directly clashes with North Korea's 'hostile two-state theory.' Second, the structure in which a hardline stance toward South Korea and conciliatory signals toward the US run on separate tracks was reaffirmed. This suggests that even if a US-North Korea dialogue phase opens in the future, South Korea may be excluded as a negotiating partner [3]. Third, the concentration of DMZ landmine explosions and rocket range upgrade tests during the same period signifies a phase shift where rhetorical threats and physical measures are combined [13][15]. Fourth, given that the US's restrained response is passive in countering North Korea's framing offensive, the need for South Korea to manage its own narrative arises.

II. In-Depth Analysis

North Korea Warns of 'Collective Punishment' in Response to USFK Commander's Remarks: In-Depth Analysis

1. Root Cause Analysis

The superficial trigger for Kang Chol-su's statement was a single sentence from Commander Brunson. However, the real target is the logical structure represented by the remark rather than the remark itself. Brunson stated that "the security of the Korean Peninsula is directly linked to the stability of Northeast Asia, the Western Hemisphere, and the entire Pacific region" [4]. This logic expands the mission of USFK from a peninsular function of deterring North Korea to a collective defense function across the entire Indo-Pacific. North Korea's denunciation of this as a "mercenary in regional conflicts" is not mere rhetoric [4]. It reveals their perception that legal and military grounds are being established for South Korea to become entangled in out-of-area conflicts, such as in the Taiwan Strait or the South China Sea.

The root cause of this backlash is intertwined with the 'hostile two-state theory' finalized since the end of 2023 [3]. From the moment Kim Jong Un redefined inter-Korean relations as "relations between two belligerents at war" [3], South Korea was no longer an object of negotiation and unification for North Korea, but a target for elimination. In this framework, South Korea's integration as the "decisive center" of the US-led collective defense system is, from North Korea's perspective, an event that adds another pretext to attack South Korea. This is precisely the logical structure behind Kang's assertion that "South Korea, which has emerged as the 'decisive center of collective defense,' will become the decisive target of collective punishment" [1][4]. In effect, North Korea has reframed South Korea's integration into the US regional strategy as a justification for attacking South Korea.

2. Structural Context

Political Structure: Separate Tracks for South Korea and the US

North Korea's external messaging has a dual structure operated separately by target. Kim Yo Jong has sent conciliatory signals through channels directed at the US, leaving open the possibility of conditional dialogue [3]. At the same time, in messages directed at Japan during the same period, she criticized Japan's transition into a "war-making state" and warned of separate military response options [6]. Kang Chol-su's statement falls under the South Korea track within this structure. The intention is clearly to exclude South Korea from the status of a negotiating partner while not completely closing the door on negotiation channels with the US. Rather than an attempt to drive a wedge into the US-ROK alliance, this is a logical extension of the 'hostile two-state theory' that does not recognize South Korea as a negotiating partner in the first place [3].

Security Structure: Strengthening Extended Deterrence and North Korea's Counteraction

Commander Brunson's remarks are directly linked to the trend of strengthening US-ROK extended deterrence and combined defense posture. Given that the remarks were made on a public stage at the Korea-US International Security Conference, they should be viewed as an extension of the alliance solidarity messages accumulated by both countries rather than an accidental slip of the tongue. The problem is that this strengthening trend clashes directly with North Korea's establishment of its nuclear doctrine. North Korea, through a spokesperson for the Ministry of National Defence, warned that strengthening US-ROK cooperation in responding to WMDs could trigger its nuclear response [7]. Furthermore, Vice Minister of National Defence Kim Kang Il declared North Korea's nuclear policy as "irreversible" at the Beijing Xiangshan Forum and pledged to strengthen military cooperation with China [11]. A cyclical structure has formed where, as the regionalization and multilateralization of the US-ROK alliance progress, North Korea utilizes this as material to reaffirm the legitimacy of its own nuclear deterrent.

Economic and Military-Technical Structure: Statement Politics Parallel with Weapon System Modernization

The range upgrade test of the 240mm multiple rocket launcher, which took place almost simultaneously with Kang Chol-su's statement, provides physical evidence supporting that the statement is not mere rhetoric. North Korea disclosed that it extended the range of the upgraded rocket to 100 km for direct fire and 115 km in gliding-composite mode. It explicitly stated that this was aimed at "keeping the enemy in constant anxiety and terror" [13]. This is a method of backing up the threat level of the statement with the range expansion of actually deployed weapon systems. The occurrence of an explosion related to landmine laying in the DMZ during the same period [15] also shows that the creation of physical tension in the border area is not proceeding separately from the statement but is mutually reinforcing.

3. Historical Precedents and Comparison of Similar Cases

This is not the first instance where North Korea has reframed remarks on strengthening institutional solidarity between the US and South Korea as a pretext for attack. A similar pattern was observed during the short-range ballistic missile launches around Wonsan in August 2026. At that time, a military commentator for the KCNA issued a commentary defining US-Japan-ROK cooperation as a "tripartite threat" and launched a missile the following day [6]. Pointing to the RIMPAC exercise as a "concrete example" of that threat is structurally identical to the current issue [6]. The pattern of North Korea redefining institutional progress in US-ROK-Japan trilateral cooperation as a basis for an existential threat to itself and combining it with force demonstrations is being repeated.

Kim Yo Jong's warning of a "more offensive" response to US-led multinational military exercises and her reaffirmation of the policy to strengthen nuclear deterrence [9] also fall within the same context. Every time US-ROK(-Japan) security cooperation is institutionalized, North Korea uses it as a new basis to justify its nuclear force. Kang Chol-su's statement is distinguished from previous cases in that this pattern has now become detailed enough to target 'individual alliance remarks.' This is evident in the fact that it took issue with a single conceptual remark by the commander rather than a visible action such as a drill or exercise.

4. Key Variables Shaping Future Developments

First is whether US-North Korea dialogue will resume. Given the circumstances where Kim Yo Jong left open the possibility of conditional dialogue through channels directed at the US [3], it is difficult to view this statement as a signal blocking the possibility of a US-North Korea summit itself. However, even if dialogue resumes, the intention to exclude South Korea as a negotiating partner is already clear. In this case, South Korea may face a paradoxical situation where it is instead marginalized during the dialogue phase.

Second is the level of the US response. The US maintained a restrained stance, focusing on reaffirming its defense commitment rather than defining the actions as provocations, both during the August missile launch phase and the current statement phase [6]. If this stance continues, an asymmetry may accumulate where North Korea's rhetorical pressure intensifies while the joint US-ROK counter-narrative remains relatively weak.

Third is the speed at which physical risks in the border area materialize. The current phase, where DMZ landmine explosions and the 240mm rocket range upgrade overlap, suggests that the statement's rhetoric is being backed by changes in actual deployment and operation. If the deployment of the rocket launchers along the border area is executed, it will mark a turning point from a rhetorical threat to a constant physical threat [13].

Fourth is the speed of strengthening the US-ROK Nuclear Consultative Group (NCG) and combined defense posture. As alliance solidarity messages like Brunson's remarks continue to be issued, the cycle of North Korea recycling them as pretexts for attack is highly likely to repeat. Managing this cycle will be a key variable in the future message design of US and South Korean authorities.