미군 증원 없이 북한의 위협에 대응할 준비를 해야 하는 한국군

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38north에 실린 글입니다. 

대만, 중동부유럽 등 광범위한 지역에서 동시다발적인 사태가 발생할 가능성이 커지고 있어 주한미군이 대만으로 이동배치될 가능성이 높아지는 등 한국의 방위전략 근간이 됐었던, 일본과 미국에서 미군 증원병력이 신속히 투입될 것이라는 가정이 점차 흔들리고 있다는 주장입니다. 일본의 후방기지 역할조차도, 미국의 적극적인 조율이 없다면 소극적이거나 대만에 우선권이 밀릴 가능성이 있겠네요. 

한반도에서 억지력은 수십 년 동안 하나의 기본 가정에 기반해왔다. 전면전이 발생할 경우, 미국의 증원 전력이 일본과 미국 본토에서 신속히 투입되고, 일본은 기존 작전계획(OPLAN 5055)에 따라 핵심적인 후방 지원을 제공한다는 것이다. 이 가정은 작전 계획뿐 아니라 한국의 방위 태세를 떠받치는 보다 광범위한 전략적 신뢰에도 영향을 미쳐왔다.

그러나 이러한 가정은 점점 더 의문시되고 있다. 중국이 대만을 침공하고 러시아가 유럽에서의 분쟁을 확대하는 동시다발적 사태가 발생할 경우, 미국이 가용한 전력에는 전례 없는 부담이 가해질 것이다. 이러한 상황에서 주한미군은 일부가 대만으로 재배치될 수 있으며, 미국의 증원은 지연되거나 축소될 수 있다. 또한 대만 해협에서 미군을 지원하기 위해 파견된 병력을 제외한 일본 자위대는 자국 영토와 주변 해역 방어에 전적으로 투입될 것이다. 이 경우 OPLAN 5055와 같은 작전 틀은 원래 계획대로 실행하기 어렵거나 사실상 불가능해질 수 있다.

이러한 상황에서 평양은 이를 드문 전략적 기회로 인식할 수 있다. 역내 미군 존재 감소, 일본의 자원 제약, 그리고 전 세계적 분산 상황이 결합되면 북한은 군사적 도발, 나아가 대규모 공격까지도 실행 가능하다고 판단할 수 있다. 그렇다면 한국은—대체로 단독으로—북한의 전면 침공을 방어할 수 있을까?

이와 같은 상황에서 전쟁 초기 단계는 즉각적인 미군 증원이 부재한 상태에서 전개될 것이며, 주한미군의 약 20~40%가 대만 해협으로 재배치될 가능성이 있다. 이에 따라 한국은 초기 충격을 흡수하기 위해 상비 전력과 사전 배치된 자산—미 육군 사전배치물자(APS)와 유사한 기능을 하는 장비와 전시 예비물자—에 의존해야 할 것이다. 북한은 이 기회를 활용해 수도권을 겨냥한 대규모 포병 및 로켓 공격, 사이버 및 전자전, 공중 및 지하 침투를 통한 특수작전을 결합한 방식으로 공격할 가능성이 높다. 이어 비무장지대(DMZ) 남쪽의 주요 작전 목표를 향한 신속한 기갑 돌파가 뒤따르며, 한국이 방어 태세를 완전히 동원하기 전에 조기 돌파를 달성하려 할 것이다.

최근 러시아-우크라이나 전쟁에서 관찰된 사례는 북한이 작전 방식을 적응시킬 가능성을 시사한다. 정찰 및 타격 임무를 위한 저비용 드론과 체공형 탄약의 사용 증가, 무인기 기반 표적 지정을 통한 포병 협조 강화는 보다 적응적이고 네트워크화된 전장 운용 방식을 보여준다. 동시에 정밀 타격에 대한 취약성을 줄이기 위한 분산 작전의 강조는 보다 발전된 군사력이 보유한 기술적 우위를 인식하고 있음을 나타낸다.

전쟁 초기 단계에서 한국의 우선순위는 즉각적인 반격이 아니라 생존과 안정화가 될 것이다. 한국군은 F-35A, F-15K, 그리고 올해 실전 배치 예정인 KF-21과 같은 우수한 공중 전력을 포함한 고도화된 ISR 능력 등 질적 우위를 유지하고 있다. 또한 M-SAM II, 패트리엇, 사드로 구성된 다층 미사일 방어 체계—위기 상황에서 미국이 이를 다른 전구로 재배치하지 않고 충분히 보충된다는 전제하에—는 일정 수준의 방어를 보장할 것이다. 그럼에도 불구하고 미군 증원이 없다면 이러한 능력은 지속적인 압박을 받을 것이다. 핵심 과제는 고강도 전투 초기 수일 동안 지휘통제 체계의 무결성과 방어 결속을 유지하는 데 있다.

한국이 초기 타격을 흡수할 수 있다면, 전쟁은 매우 높은 확률로 장기적 고강도 방어 단계로 전환될 것이다. 이 단계에서는 한국의 화력 우위가 점점 더 중요해진다. 특히 대포병 작전 분야에서의 정밀 타격 능력은 북한 포병 체계를 신속히 제압할 수 있게 해준다. K9 자주포와 유도탄의 결합은 북한의 지속적인 공세 동력을 약화시키는 데 핵심적인 역할을 할 것이다.

공중전력 또한 결정적 요소가 되지만, 그 효과는 한국이 얼마나 빠르게 한반도 상공의 제공권을 확보하느냐에 달려 있다. 북한 공군은 역량이 제한적이지만, SA-2, SA-3, SA-5로 구성된 통합 방공망은 여전히 작전 제약을 가할 수 있다. 따라서 공중 영역의 통제 확보와 유지가 방어 작전뿐 아니라 이후 반격 작전에서도 중요하다.

동시에 한국의 네트워크 중심전 수행 능력은 중요한 이점을 제공할 수 있다. 다만 이는 지휘통제, 통신, 컴퓨터, 정보, 감시 및 정찰 체계가 견고하게 유지된다는 전제하에서다. 보다 빠른 의사결정과 효과적인 표적화는 수적 열세를 보완하고 전장을 안정화하는 데 기여할 수 있다. 또한 한국 방위산업 기반의 견고함은 매우 중요한 회복 탄력성의 원천으로 작용한다. 전시에는 정부 주도의 동원 조치를 통해 수출 중심 산업 기반을 재편하여 민간 산업을 방위 공급망에 편입할 수 있다. 2022년 전쟁 초기의 우크라이나와 달리 한국은 주요 탄약과 장비를 중단 없이 생산할 수 있는 산업 역량을 갖추고 있어 외부 보급 의존도를 줄일 수 있다.

그럼에도 불구하고 상당한 취약점은 여전히 존재한다. 지속적인 전투는 탄약 비축량에 큰 부담을 줄 것이며, 유엔군사령부 후방기지(UNC-R)에 저장된 탄약은—미사일 방어 요격체계를 포함하여—대만 작전을 위한 미군 보급에 우선 사용될 수 있다. 수도권의 고밀도 도시 환경은 포병과 미사일 일제 사격에 매우 취약하며, 이는 정치적으로 감당하기 어려운 압박을 초래할 수 있다. 특히 한국의 민방위 대비태세가 완전히 견고하지 않은 상황에서 더욱 그렇다. 동시에 항공기와 지휘 노드와 같은 고가 자산의 손실은 점진적으로 작전 효율을 약화시킬 것이다. 미군 지원을 기대할 수 없다면 수 주 이상의 고강도 작전을 유지하는 것은 점점 더 불확실해진다.

이 시나리오에서 가장 위험한 변수 중 하나는 저위력 전술핵무기의 사용 가능성이다. 애틀랜틱 카운슬의 최근 시뮬레이션에 따르면, 평양은 제한적 핵 사용을 방어 결속을 붕괴시키고 정치적 충격을 유발하며 외부 개입을 억제하는 수단으로 인식할 수 있다. 미국의 확장 핵 억지력이 즉각적으로 가시적이거나 신뢰할 수 없는 상황에서는 한국이 심각한 전략적 딜레마에 직면할 수 있다. 비례적인 재래식 대응만으로는 억지력을 회복하지 못할 위험이 있으며, 반대로 확전은 북한의 추가 핵 사용 위험을 수반한다.

한국의 기존 교리적 수단인 ‘3축 체계’—킬체인, 한국형 미사일 방어(KAMD), 대량응징보복(KMPR)—는 이러한 위협에 대응하기 위한 개념적 기반을 제공한다. 그러나 실제로 핵무기가 사용될 경우 그 실질적 효과는 불확실하다. 문제는 작전뿐 아니라 심리적·정치적 측면에도 있으며, 정부는 국민 신뢰를 유지하고 확전 위험을 관리해야 한다.

이러한 제약 하에서 미군 증원이 없는 전쟁의 전체적 결과는 조건부가 될 것이다. 단기적으로 한국은 북한의 신속한 돌파를 저지하고 주요 방어선을 안정화하며 진격하는 병력에 상당한 피해를 입힐 가능성이 높다. 그러나 중기적으로 상황은 불투명해질 가능성이 크다. 장기전은 군수 체계에 부담을 주고 탄약 가용성을 감소시키며, 민간 혼란은 군사 작전에 추가적인 제약을 가한다. 장기적으로는 외부 지원의 부재가 억지력 신뢰성과 작전 템포를 유지하는 것을 극도로 어렵게 만든다. 한국은 완전한 패배를 피할 수는 있겠지만, 단독으로 결정적 승리를 달성하는 것은 훨씬 더 어려울 것이다.

이러한 현실은 한국을 넘어서는 정책적 함의를 시사한다. 서울에게 가장 시급한 과제는 장기간 자율적으로 작전을 수행해야 하는 상황에 대비하는 것이다. 이를 위해서는 수개월간의 고강도 전쟁을 견딜 수 있는 정밀유도탄과 요격체계—특히 M-SAM II와 L-SAM II—의 비축 확대와 사이버 및 물리적 공격에 대한 지휘통제 체계의 강화가 필요하다. 또한 AI 기반 표적화와 장거리 정밀 타격을 포함한 대포병 능력에 대한 투자는 필수적이다. 동시에 한국은 즉각적인 미군 지원이 없는 상황에서도 북한 지도부에 심각한 비용을 부과할 수 있는 비핵 억지력의 신뢰성을 강화해야 한다.

미국에게는 다중 전구에서 억지력의 신뢰성을 유지하는 것이 핵심 과제다. 이를 위해서는 핵심 자산의 선택적이고 급증형 전방 배치, 양 전구에 걸친 다층적 핵 억지 접근법 채택, 그리고 기존 억지 태세를 훼손하지 않도록 한국과 충분한 협의 없이 주한미군을 일방적이고 급작스럽게 재배치하는 것을 피하는 것이 필요하다.

일본에게는 대만 유사 상황에서도 일정 수준의 후방 지원과 한국과의 협조를 유지할 수 있도록 하고, 2023년 캠프 데이비드 3자 정상회의를 참고하여 기능적인 3국 협력 메커니즘을 강화하는 것이 필요하다. 이는 여건이 악화된 상황에서도 효과적으로 작동할 수 있어야 한다.

궁극적으로 상당 규모의 미군 증원이 적시에 도착할 것이라는 기존의 가정은 전략적 위기가 중첩되는 시대에는 반드시 적용되지 않을 수 있다. 한국은 무방비 상태가 아니며, 첨단 기술과 견고한 산업 기반에 의해 뒷받침되는 지역 내 가장 역량 있는 군대 중 하나를 보유하고 있다. 그러나 자립이 곧 자급자족적 승리를 의미하는 것은 아니다. 억지력을 유지하기 위해 워싱턴, 도쿄, 서울은—그 가능성이 아무리 낮더라도—다음 한반도 분쟁이 한국이 사실상 단독으로 대응하는 상태에서 시작될 수 있다는 가능성에 대비해야 한다.

How South Korea Might Fight a North Korean Invasion in a Dual-Contingency Scenario  - 38 North: Informed Analysis of North Korea

How South Korea Might Fight a North Korean Invasion in a Dual-Contingency Scenario  - 38 North: Informed Analysis of North Ko

How South Korea Might Fight a North Korean Invasion in a Dual-Contingency Scenario 

• By: Ju Hyung Kim
• April 23, 2026
• Foreign Affairs, Military Affairs

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(Source: By 대한민국 국군 Republic of Korea Armed Forces – 2012.11.10 대한민국 공군 Rep.of Korea Air Force, CC BY-SA 2.0 via Wikimedia Commons)

For decades, deterrence on the Korean Peninsula has rested on a single fundamental assumption: that in the event of an all-out war, US reinforcement would be swiftly introduced both from Japan and the continental United States, while Japan would provide crucial rear-area support in accordance with the existing operational plan—OPLAN 5055. This assumption has shaped not only operational planning, but also the broader strategic trust that has buttressed South Korea’s defense posture. 

However, such an assumption is increasingly being questioned. A simultaneous contingency—China initiating a military invasion against Taiwan, and Russia enlarging the conflict in Europe—would place unprecedented strain upon US available forces. Under such conditions, USFK could be partially redeployed to Taiwan, US reinforcement could be delayed or curtailed, and the Japanese Self-Defense Forces—except for those that are sent to the Taiwan Strait to support US war efforts—would be fully absorbed in the defense of their territory and surrounding waters. Operational frameworks like OPLAN 5055 would become difficult, or even impossible, to execute as originally outlined. 

In such a case, Pyongyang may see these conditions as presenting a rare strategic opportunity. The convergence of reduced US presence in the region, Japan’s resource constraints, and heightened global distraction could lead North Korea to think that military provocation—and even a large-scale attack—might be feasible. But could South Korea defend itself—largely alone—against a full-scale North Korean invasion? 

In such a contingency, the early stages of the war would be defined by the absence of immediate US reinforcement, with an estimated 20 to 40 percent of USFK potentially redeployed to the Taiwan Strait. Naturally, South Korea would have to rely on its standing forces and prepositioned assets—including prepositioned equipment and wartime reserve stocks, similar in function to US Army Prepositioned Stocks (APS)—to absorb the initial shock. North Korea would likely exploit this window of opportunity through a combination of massive artillery and rocket attacks targeting the Seoul metropolitan area, cyber and electronic warfare, and special operations infiltration through airborne and subterranean methods. Rapid armored thrusts toward major operational targets south of the demilitarized zone (DMZ) would follow, aiming to achieve an early breakthrough before South Korea fully mobilizes its defense capabilities. 

Recent observations from the Russia-Ukraine War suggest the possibility of North Korea’s adaptation of its operational approach. The increased use of low-cost drones and loitering munitions for reconnaissance and strike missions, paired with enhanced artillery coordination enabled by UAV-based targeting, indicates a more adaptive and networked battlefield methodology. At the same time, the emphasis on distributed operations—in order to reduce vulnerability to precision strikes—showcases North Korea’s awareness of the technological advantages held by more advanced militaries. 

In this early phase of the war, South Korea’s priority would be survival and stabilization, rather than immediate counteroffensive action. The South Korean military maintains a qualitative edge that includes advanced ISR capabilities and superior air platforms like the F-35A, F-15K, and KF-21—it will enter service this year. Meanwhile, a multi-layered missile defense architecture comprised of M-SAM II, Patriot, and THAAD batteries—assuming they are replenished and if the US does not relocate them again to other theaters during the crisis—would ensure some degree of defense against inbounding threats. Nonetheless, without US reinforcement, these capabilities would be under sustained stress. The critical challenge would be to preserve command-and-control integrity and defensive cohesion during the first several days of high-intensity conflict. 

If South Korea were able to absorb the initial blow, the war would very likely be transformed into a protracted high-intensity defense phase. In this stage, South Korea’s superiority in firepower would become increasingly important. Precision strike capability, particularly in the field of counter-battery operations, would enable the rapid suppression of North Korean artillery systems. The K9 self-propelled howitzer, coupled with guided munitions, would play a crucial role in degrading North Korea’s sustained offensive momentum. 

Airpower would also become a decisive element, yet its overall effectiveness would depend on how quickly South Korea secures air superiority over the skies of the Korean Peninsula. Although the North Korean air force remains limited in its capacity, its integrated air defense network—an amalgam of SA-2, SA-3, and SA-5—could still impose operational constraints. Therefore, achieving and maintaining control of the air domain would be critical not only during defensive operations, but also during subsequent counteroffensive operations. 

At the same time, South Korea’s network-centric warfare capability could offer a significant advantage—provided that its command, control, communications, computers, intelligence, surveillance, and reconnaissance systems remain resilient under. Faster decision-making cycles and effective targeting could contribute to compensating for numerical inferiority and stabilizing the battlefield. In addition, the robust foundation of South Korea’s defense industrial base functions as an invaluable source of resilience. In wartime, South Korea’s export-oriented industrial base could be reshuffled through government-led mobilization measures, enabling the incorporation of civilian industry into the defense supply chain. Unlike Ukraine in the early stages of the war in 2022, South Korea possesses the industrial capacity to produce major ammunition and equipment without interruption—ultimately reducing reliance on external resupply. 

Nevertheless, significant vulnerabilities would remain. Sustained combat would place a heavy burden on munition stockpiles—munitions stored in the United Nations Command-Rear (UNC-R) bases could be prioritized to resupply US forces for Taiwan operation—including missile defense interceptors. The dense urban environment of the Seoul metropolitan area would be highly exposed to artillery and missile salvo attacks, imposing prohibitive political pressure—particularly given that South Korea’s overall civil defense readiness remains less than fully robust. Meanwhile, the loss of high-end assets, including aircraft and command nodes, would incrementally weaken operational efficiency. If US assistance cannot be expected, sustaining high-intensity operations beyond several weeks would become increasingly uncertain. 

One of the most dangerous variables in this scenario is the potential use of low-yield tactical nuclear weapons. Recent simulations conducted by the Atlantic Council illustrate that Pyongyang may view limited nuclear use as a means to collapse defensive cohesion, trigger political shock, and deter outside intervention. In a situation where US extended nuclear deterrence is not immediately visible or credible, South Korea could face a serious strategic dilemma. A purely proportional conventional response would risk failing to restore deterrence, while escalation carries the danger of further nuclear use by North Korea. 

South Korea’s existing doctrinal tools—the Three-Axis System comprised by the Kill Chain, Korea Air and Missile Defense (KAMD), and Korea Massive Punishment and Retaliation (KMPR)—offer a conceptual basis for responding to such threats. However, if nuclear weapons were to be actually deployed, their practical effectiveness would remain uncertain. The challenge would be psychological as well as political—not only operational—as the government would need to maintain public trust and manage the risk of escalation. 

Under such constraints, the overall outcome of the war without US reinforcement would be conditional. In the short term, South Korea has a high chance of preventing North Korea’s rapid breakthrough, stabilizing major defense perimeters, and inflicting notable attrition on advancing forces. Nonetheless, the situation would likely become murky in the medium term. Protracted combat would strain the logistics system, reduce the availability of ammunition, while civilian disruption would impose additional constraints on military operations. In the long term, the absence of external support would make it extremely difficult to maintain deterrence credibility and operational tempo. To be sure, South Korea would be able to avoid a complete defeat. But achieving a decisive victory alone would be far more challenging. 

These realities suggest policy implications that go beyond South Korea. For Seoul, the most urgent task is to prepare for a scenario in which it is required to operate autonomously for an extended period of time. To make this possible, it would necessitate expanding stockpiles of precision-guided munitions and interceptors—especially the M-SAM II and L-SAM II—that could withstand months of high-intensity warfare, and hardening command-and-control systems against cyber and kinetic disruptions. Investments in counter-artillery capabilities, including AI-based targeting and long-range precision strike, would be a sine qua non. At the same time, South Korea should strengthen the credibility of its non-nuclear deterrence capability that could impose severe costs on the North Korean leadership even when immediate US support is unavailable. 

For the United States, the central challenge hinges on maintaining the credibility of its deterrence across multiple theaters. This would require selective, surge-based forward deployment of critical assets to the Korean Peninsula, adoption of a layered nuclear deterrence approach across both theaters, and avoiding a unilateral, abrupt redeployment of USFK without reasonable or sufficient consultation with the South Korean counterparts so as not to undermine the existing deterrence posture. 

For Japan, it is necessary to ensure that some level of rear-area support and coordination with South Korea can be sustained even in the context of a Taiwan contingency, while strengthening a functional trilateral cooperation mechanism—using the 2023 Camp David trilateral summit as a reference point—that can operate effectively even under degraded conditions. 

Ultimately, the long-held assumption that sizeable US reinforcement would arrive in time may not necessarily apply in an era of overlapping strategic crises. South Korea is not defenseless; it possesses one of the most capable militaries in the region, underpinned by advanced technology and a robust industrial base. Yet self-reliance does not necessarily equal a self-sufficient victory. To maintain deterrence, Washington, Tokyo, and Seoul should prepare for the possibility—no matter how low it may be—that the next conflict on the Korean Peninsula may begin with South Korea standing largely on its own. 

[백선호]

북한이 예를 들어 철원같은 곳을 핵무기로 공격했는데 '서울을 공격한 것은 아니잖아, 현무 V로 평양 때리는 것은 참자' 이렇게 나올 수도 있다는 뜻일까요?

[위종민]

미국이 그런 식으로 나올 가능성은 충분히 높을 것 같습니다. 예전에도 그런 적이 없었던 게 아니니.

[백선호]

우리도 그런 결정을 할 가능성이 있지 않을까요???

[위종민]

기사의 논지와는 별개로, 연평도 포격도발이나 서부전선 포격 도발 당시 우리는 시종일관 확전을 극도로 자제했으니 비슷한 결정을 내릴 가능성이 아주 높겠죠...

[김용우]

예전에도 비슷한 시나리오가 이슈가 되었던 적이 있었죠. 북한이 중소도시에 핵투발해서 대량 인명피해낸 다음에 다음은 서울이다라는 식으로 남한에 협박넣으면 남한국민과 정부가 쫄아서 협상에 나서면 미국쪽에서 손쓸 겨를도 없이 일이 끝날 꺼라는 시나리오였죠.

[김유철]

예상 시나리오가 양안전쟁에서 제2전선으로 열릴 경우와 북한이 단독으로 고강도의 도발을 해올 경우인데.... 전자는 아무래도 미군도 정신없으니 주전장이 양안이고 한국군이 홀딩하고 반격하는 방안이 유력해지겠고, 후자의 경우는 천안함이나 목함지뢰처럼 도발원점이 즉각 판명되지 않으면 뭉개지기 쉽겠고, 연평도건처럼 도발주체가 명백해도 의지의 문제가 되갰네요....

[위종민]

중국이랑 북한이 관계를 개선하면 순서를 바꿔서 북한이 도발하고, 미국이나 일본의 전력을 이 쪽으로 집중시키고 양안전쟁을 개전할 수도 있고요.

일단 우리는 비례대응 원칙에 발목잡혀 있기도 하고.. 사실 한국 단독으로 고강도의 도발이 전쟁으로 확전된다고 해도 미국이 이전에 우리가 기대했던 것처럼 지원해줄 수 있는지, 지원할 생각이 있는지 이제는 원점에서 검토해야 될 시기인 것 같긴 합니다.

[스피드조(조용진)]

결국 이대로 가다가는 미국의 안보공약에 대한 신뢰자체가 크게 감소할텐데 자체 핵무장론에 더 힘이 실릴지도 모르겠습니다 요즘 세상 돌아가는 꼴을 보면 국제사회의 경제제재라는것도 제대로 작동할까 의문이 들기도 하고요

[위종민]

최근에 본 글에서 경제제재는 그 제재를 우회하는 구조를 만들게 강제해서 효과가 떨어지는 문제가 있다고 하더라고요. 이란도 이런 비효율적이지만 제재를 우회하는 경제체제를 꽉 쥐고 있는 조직이 IRGC라 무소불위의 권력을 쥐게 됐다고 합니다.

뭘 줘야 뺏는 게 억지력이 되지 주지도 않으면 신경쓸 이유가 없죠.