I am not on Russian side here absolutely, but there is a big difference in North Korea helping Russia directly vs any of the NATO states getting involved in Ukraine directly.
Has anyone from the, lets roughly call it a Western Bloc, threatened to start a World War if some random country helps Russia? Because no, nobody didn't.
On the other hand, Russia has treathened to start World War if NATO gets involved. Now, Russia is a fecking bully obviously, and it is obvious western Bloc countries are not as crazy and nobody is willing to test if Putin is as crazy as he claims he is.