As the war in Ukraine drags on toward a fourth year, North Korea is preparing to send Moscow more troops beyond the 12,000 already there, as well as additional weapons, including suicide drones, according to the latest assessment from South Korean intelligence.

Ukrainian President Volodymyr Zelenskyy said more than 3,000 North Korean soldiers have been killed or wounded fighting for Moscow in Russia's western Kursk region.

"Through various sources of information and intelligence, we assess that North Korean troops who have recently engaged in combat with Ukrainian forces have suffered around 1,100 c