A thousand North Korean troops have been killed or wounded in the last week fighting in Ukraine, the US has said. White House National Security Council spokesman John Kirby told reporters that Russia was deploying “human waves” of North Korean soldiers, and at least one soldier captured by Ukraine died of his injuries, according to NBC News.

Ukraine’s President Volodymyr Zelensky said Friday that several “seriously wounded” North Korean soldiers died from their injuries after being captured by Ukrainian forces.