As North Korean soldiers fighting for Russia vanish from the front line, Ukraine fears their retraining could turn them into deadlier adversaries. Reporting from Sumy, The Times’ Maxim Tucker investigates why so many North Koreans have perished on the battlefield.

The World in 10 is the Times' daily podcast dedicated to global security. Expert analysis of war, diplomatic relations and cyber security from The Times' foreign correspondents and military specialists. 

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