South Korea's military said on Friday that it suspects North Korea is preparing to send more troops to Russia to fight Ukrainian forces, even after suffering losses and seeing some of its soldiers captured.

South Korea’s spy agency told lawmakers on Monday that two North Korean soldiers who were captured by Ukrainian forces while fighting alongside Russian forces in Russia’s Kursk border region haven’t expressed a desire to seek asylum in South Korea.

Lt. Gen. Kyrylo Budanov said North Korea has already provided Russia with 120 self-propelled artillery guns and 120 multiple-launch rocket systems, with more to come.