The Pentagon has repeatedly said they have no proof North Korean soldiers are in Ukraine.

A world war would be reserved for "great powers" once again fighting each other. Since WWII, the US has been the world's only great power, facing little opposition from the supplicated Europe and Japan. When some combination of those gang up on a perpheral nation, that is not a world war.

When a country is suddenly able to militarily pose a threat to this trinity, along with Canada and Australia and Sputh Korea, suddenly everyone in America with a cushy enough job to have anxiety as their main problem rather than exhausted living expenses constantly, global thermonuclear threat rises to the level of home burglary on their list of concerns. Yeah I think it's pathetic, I got over fear of nuclear war when I was like eleven. Every country should have nuclear weapons. Keeps it honest.