South Korea's spy agency says an estimated 4,700 North Korean soldiers have been killed or wounded while fighting alongside Russia against Ukrainian forces.

The number of North Korean troops killed while fighting for Russia in Moscow's war against Ukraine is 600, South Korea has said. North Korea's total casualties, including those who were killed, were 4,

North Korea confirmed for the first time on Monday that it had sent troops to fight for Russia in the war in Ukraine under orders from leader Kim Jong Un.