For decades, the Republic of Korea Army has prepared for a second Korean War in which North Korean armored formations break through the frontline, threaten Seoul, and trigger a rapid political-military crisis.
That assumption helped build one of the largest tank forces in Asia. South Korea has invested heavily in the K1 family — the original K1, K1E1, K1A1, K1A2, and the emerging K1E2 modernization — and later the K2 Panther, maintaining a force designed to deter invasion, restore the frontline, and conduct counter-offensives.
That logic isn’t obsolete. It’s no longer sufficient.
Ukraine’s modernization of its Leopard 1 tanks with Belgium’s Cockerill turret offers a useful warning. The Cockerill 3105 pairs NATO’s standard 105mm gun with an autoloader and modern sensors, letting an aging vehicle operate as an effective fire-support platform from covered positions.
Kyiv isn’t merely upgrading old armor; it’s adapting an old platform to survive a battlefield shaped by drones, loitering munitions, artillery saturation, and constant surveillance.
South Korea shouldn’t replicate Ukraine directly. The Korean Peninsula isn’t southern Ukraine, and Seoul still needs heavy armor to defeat large-scale North Korean armored and mechanized forces.
The lesson isn’t that K1 or K2 tanks should give way to light tanks, it’s that South Korea’s armored force must adapt to a battlefield that is more transparent and more saturated with drones than the one it was built for.
Republic of Korea Army soldiers participate in a live-fire armored exercise near Yongmoonsan Mountain, South Korea. Photo: Seung-il Ryu/NurPhoto via AFP
A Peninsula Under Watch
The urgency is real. North Korea is watching the war in Ukraine closely, and its troops have gained direct experience from the European front. Pyongyang is expanding its unmanned systems, including reconnaissance drones, combat drones, and possibly AI-enabled capabilities.
Even crude drones could complicate the movement of South Korea’s mechanized units in the narrow invasion corridors north of Seoul, where advanced tanks could be destroyed once detected, isolated, and attacked from above.
South Korea should draw three conclusions.
First, preserve heavy armor, especially the K2, but stop treating tanks as an independent instrument for breakthroughs. Every armored battalion should field its own reconnaissance drones, first-person view drone defenses, electronic-warfare detachments, camouflage and deception teams, and short-range air defense.
South Korea’s plans to train 500,000 drone warriors and build the Korea Low-cost Uncrewed Combat Attack System (K-LUCAS) fit naturally into this framework.
Second, apply a limited version of Ukraine’s modernization concept to older platforms, but only as a complement to main battle tanks, not a replacement. The best candidates are older K1-series vehicles, retired chassis, engineering variants, and a possible K21-based fire-support vehicle.
A Korean equivalent of the Cockerill 3105 could serve as a protected mobile fire-support platform for urban defense, rear-area security, coastal defense, or rapid reinforcement. Its mission would likely be to support infantry, engage light armor and fortifications, and fire from covered positions under drone observation, rather than trading blows head-on with North Korean armor.
The K2 Black Panther. Image: Hyundai Rotem
Third, prioritize survivability over gun upgrades. The urgent question isn’t whether a tank carries a 105mm or 120mm gun, it’s whether the vehicle survives after being detected.
Modernization should include active protection systems, top-attack protection, soft-kill defenses, laser-warning receivers, acoustic detection, electronic-warfare protection against first-person view drones, and modular overhead protection where appropriate.
This demands doctrinal change too. Armored units should move in smaller, dispersed formations; operate under sustained drone surveillance; use decoys routinely; execute rapid shoot-and-scoot fire; and coordinate with loitering munitions rather than simply defend against them.
Tanks can no longer sit in predictable assembly areas unless protected by camouflage, air defense, and electronic warfare.
Repurposing the Old Fleet
The K1 force deserves particular attention.
The best-maintained K1A2 vehicles, with their 120mm guns, should stay in armored units after survivability and networking upgrades.
Older K1 or K1E1 platforms could convert into support variants, counter-drone gun platforms, mobile electronic-warfare vehicles, unmanned-turret fire-support vehicles, ammunition resupply vehicles, or decoy emitters.
Some may deliver more value as specialized support vehicles than as tanks.
The K21 infantry fighting vehicle family deserves renewed attention as well. A K21-105, a 105mm fire-support vehicle built on the K21 chassis, could fill the capability gap below the K2, supporting infantry in complex terrain, reinforcing threatened frontlines, and offering mobile precision firepower where heavy tanks are unnecessary or too costly to risk.
It should remain a complement, not a replacement: a K21-105-type vehicle can’t match the K2’s protection and shouldn’t take on its mission.
The possibility of a large-scale North Korean armored attack hasn’t disappeared. But the next tank war on the Korean Peninsula may not open with tank guns firing across open ground; it could begin with small drones hunting engine heat, artillery waiting for coordinates, and loitering munitions circling above assembly areas.
South Korean tanks will remain essential, but their battlefield value will hinge on whether they can survive the first cycle of detection and attack and still bring the mobility and firepower needed to complete their mission.
Dr. Ju Hyung Kim currently serves as the President at the Security Management Institute, a defense think tank affiliated with the South Korean National Assembly.
He has been involved in numerous defense projects and has provided consultation to several key organizations, including the Republic of Korea Joint Chiefs of Staff, the Defense Acquisition Program Administration, the Ministry of National Defense, the Korea Institute for Defense Analysis, the Agency for Defense Development, and the Korea Research Institute for Defense Technology Planning and Advancement.
He holds a doctoral degree in international relations from the National Graduate Institute for Policy Studies in Japan, a master’s degree in conflict management from the Johns Hopkins University School of Advanced International Studies, and a degree in public policy from Seoul National University’s Graduate School of Public Administration.
Dr. Kim has published extensively across leading international security and defense platforms, including The Diplomat, War on the Rocks, the Modern War Institute, 38 North, Asia Times, Small Wars Journal, RealClearDefense, Modern Diplomacy, the Lowy Institute, Global Security Review, the Geopolitics, and Global Defense Insight, among others.
The views and opinions expressed here are those of the author and do not necessarily reflect the editorial position of The Defense Post.
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