Of course, Russia is the warmonger and aggressor, but that’s a given. They’ve been using mercenaries all along, but the Norks being there was never proven. They certainly didn’t enter the Ukraine. Whatever the case on that doesn’t excuse Ukraine for trying to widen the war.
“Russia acknowledged for the first time that North Korean troops were on the front lines of its war with Ukraine, with a senior military official crediting their role in helping Russian forces reclaim control of the Kursk region.
“I would like to separately note the participation ... of military personnel of the Democratic People’s Republic of Korea,” Valery Gerasimov, the Russian chief of general staff, told Russian President Vladimir Putin in a report Saturday.”
https://www.nbcnews.com/news/world/noth-korea-3000-troops-russia-ukraine-rcna198123