They talk a big game but they aren’t actually that unfriendly in practice. They haven’t funded terrorist organizations or tried to engineer coups in other countries, mostly because they don’t have the money or power to but still there are way worse actors on the world stage that the world happily deals with. Just look at Israel which has almost no international sanctions, and Russia with only about a quarter of the world doing some half assed sanctions for a blatant war of aggression.
They’re the hermit kingdom and the leadership is mostly concerned with the brutal subjugation of there own citizens and not international affairs.
They have been making nukes but that’s more of a defensive response to the loaded gun the u.s. has been pointing at them since there inception rather than some crazy plot to carry out a suicidal offensive nuclear assault on the u.s. or the south.