Putin broke the Budapest Agreement with Ukraine.
Well, you win the debate, right there. I'm convinced. And it's TOTALLY a great reason to have a global nuclear war over who controls the Russian Donbass. (Which has only changed control 173 times in history, in the region called "The Ukraine," meaning "The Borderland," which was never an independent nation in history before 1991, after the breakup of the USSR.)
But by all means, let's push toward a global nuclear war over it in 2022.
