Kim Jong Un and Vladimir Putin shake hands.North Korean State MediaNorth Korean forces are being sent forward in "human waves" against Ukraine, the White House said.A spokesperson said the tactic has resulted in heavy casualties, with more than 1,000 killed or wounded in the past week.The North Korean troops are treated as expendable and sent on "hopeless" assaults, they said.North Korean forces are suffering heavy casualties as they carry out "human wave" attacks against Ukrainian troops, a White House spokesperson has said.White House National Security Council spokesperson John Kirby said on Friday that the US now assesses North Korean soldiers are carrying out "massed, dismounted assaults" against Ukrainian forces in Russia's Kursk region."And these human wave tactics that we're seeing haven't really been all that effective," Kirby said.