North Korea is tripling the number of troops fighting for Russia in Ukraine, sending 25,000 to 30,000 more soldiers, CNN reported, citing an intelligence assessment from Ukrainian officials. The country sent 11,000 troops to help repel Ukraine from the Kursk region of Russia last November. About 4,000 North Korean soldiers have been killed, CNN reported. Russian President Vladmir Putin did not confirm North Korea's involvement until late April.