North Korea will deploy military personnel to support Russia’s war in Ukraine

What's this about?

People disagree about whether North Korea sent troops to help Russia fight Ukraine. Most signs now say North Korea did send troops, mainly near Kursk.

What supporters say

• South Korean and U.S. spy groups said North Korea sent many troops to Russia.
• NATO said North Korean units worked in Russia’s Kursk area.
• Photos from space, videos, and travel records showed troops training in Russia.
• North Korea later said it sent troops, and they fought with Russian forces.

What critics say

• We do not know the exact number of North Korean troops Russia received.
• We do not know who gave these troops orders or what jobs each unit had.
• Some early claims came from spy groups, so people wanted more proof.
• Ukraine said it caught hurt North Korean soldiers, but full checks could give stronger proof.

The bottom line

The signs strongly show that North Korea sent troops to help Russia’s war effort, especially near Kursk. We still do not know the full troop count, their chain of command, or every task they did.

North Korea has deployed military personnel to support Russia’s war in Ukraine, particularly in operations linked to Russia’s Kursk region, the available evidence strongly indicates. The broad fact of a deployment is now much clearer than the exact number of troops sent, their command structure or the details of their battlefield role.

The case for

The evidence rests first on converging assessments from several governments. South Korean intelligence said North Korea had decided to send about 12,000 personnel. The U.S. Department of Defense said thousands of North Korean troops had entered Russia and were training there. NATO later said North Korean units were operating in Russia’s Kursk region. 1

Those assessments were reinforced by public reporting based on satellite images, open-source videos, transport activity and evidence of training. Institutional analysis also suggested that North Korean forces were likely to be used in Russia’s counteroffensive in Kursk (see Figures 1 and 2). Taken together, these accounts point to more than arms transfers or political backing: they indicate that personnel were sent for conflict-related duties.

The strongest development was North Korea’s own later acknowledgment. Reuters and the Associated Press reported in 2025 that Pyongyang confirmed it had sent troops to Russia, and that its forces had fought alongside Russian troops or taken part in Kursk-related operations. That admission greatly reduced the earlier uncertainty over whether any deployment had occurred. 2

Reports that Ukraine captured wounded North Korean soldiers in Kursk could offer even more direct battlefield evidence, if fully authenticated. Such captures would be stronger proof than early intelligence estimates alone, and they fit with the wider record of a North Korean deployment. 3

The troop presence also matches a broader deepening of military ties between Moscow and Pyongyang. Their 2024 strategic-partnership treaty included a mutual-assistance clause, while governments and research institutions have documented North Korean supplies of ammunition, missiles and other military equipment to Russia. This does not by itself prove troops were deployed, but it makes personnel support a credible part of the expanding relationship (see Figure 3). 4

The case against

The main reservations concern the detail, not the basic finding that troops were sent. Initial public reports depended heavily on intelligence assessments, official statements, satellite imagery and open-source material. They did not include transparent personnel records or complete, independently verified battlefield documentation. 5

That means the early estimate of roughly 12,000 troops was not fully independently confirmed at the time. Nor were claims about which units moved, how prepared they were, where they went or what missions they were assigned. Much of the available information came from governments or parties involved in the conflict, which have clear reasons to shape public understanding of events.

Important questions also remain about the troops’ military role. The Center for Strategic and International Studies has highlighted uncertainty about their effectiveness and command arrangements. The Institute for the Study of War has cautioned that available battlefield information gives only a limited picture of how North Korean forces were used in Kursk.

Reported casualty figures are similarly uncertain. Ukrainian intelligence estimates suggesting thousands of North Korean casualties may point to substantial combat involvement, but such totals are difficult to verify independently in a wartime environment. The same caution applies to reports of captured soldiers: they are potentially powerful evidence, but comprehensive authentication remains limited. 6

The bottom line

The evidence strongly supports the conclusion that North Korea deployed military personnel in support of Russia’s war effort, with high confidence that troops were sent to Russia and participated in operations connected to Kursk. This conclusion is backed by South Korean, U.S. and NATO assessments, North Korea’s later acknowledgment, and reports consistent with direct battlefield evidence.

What remains uncertain is the scale and character of that involvement. The number of personnel, their unit-by-unit assignments, chain of command, casualties and exact combat performance are not established with the same confidence. North Korean troops should therefore be seen as one part of a wider military partnership with Russia—not as a basis for accepting every reported figure or battlefield claim.