Ukrainian special forces have released several excerpts from a purported diary it said was found on a North Korean soldier killed in front-line fighting in Russia.

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,

The North Korean losses amount to almost 10 percent of the country’s deployment to Russia, the Biden administration said.

North Korea is suffering “heavy casualties,” White House National Security Council spokesperson John Kirby told reporters.