North Korea sent its best troops to aid Russia in its war against Ukraine. But after months of suffering severe losses, they have been taken off the front line.

North Korean troops fighting for Russia have been pulled from the front line for extra training after crude tactics led to massive casualties.

The spokesman did not say how long that front line was. And while this is not the full picture, it does suggest significant North Korean casualties. Separately, the New York Times also reported that the North Koreans had been pulled off the front lines.

North Korean troops have not been seen on the frontlines in Russia’s Kursk region for several weeks, a Ukrainian military official said Friday, amid reports of mass casualties among Pyongyang’s forces.

Although the North Korean troops were highlighted as a decisive escalation in the conflict, their performance appears to have fallen well short of expectations.