North Korea has reportedly sent more than 10,000 troops to fight in Russia's war against Ukraine. But many among them have fallen. Seoul puts the number of those killed or wounded at more than a thousand, while Kyiv says it has exceeded 3,000. Still, Pyongyang appears to be preparing to send more soldiers to help Russia, according to South Korea's military. CNA's Lim Yun Suk has more.

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