Imagine the Russian soldiers' parents reading this, and then getting a phone calls from their sons, now POWs, but still alive.
Also, Russian soldiers are dying too. It is fair to guess they are more likely to die then become POW.
It is not like average north Korean would routinely watched Marvel movies.
https://www.x-rayaudio.com/x-rayaudioproject/ https://www.dazeddigital.com/music/article/32308/1/russia-x-...
You can check rublacklist.net for more detailed stuff and rulings.