Ukrainian President Volodymyr Zelenskyy said on Tuesday that Russia fired North Korean missiles in an overnight attack that killed six and wounded 19 in the southeastern city of Zaporizhzhia. ADVERTISEMENT ADVERTISEMENT"The city was struck with North Korean ballistic missiles, Zircons, and guided aerial bombs," he said, referring to Russia's hypersonic cruise missile system, Zircon. Zelenskyy had warned on Monday evening that Russia was preparing to station more North Korean troops on its territory and had already received more ballistic missiles from Pyongyang. Moscow used the North Korean troops in a counteroffensive later that year that pushed Ukrainian forces out of the border Kursk region. Kursk offensiveAbout 600 North Korean troops were killed fighting for Russia against Ukrainian forces, South Korea’s spy agency told lawmakers last year.