It’s a seriously dangerous situation and no mistake. Is it fair to let millions of Ukrainians lose their freedom and/or lives because of this madman? The answer is probably “yes”, though no one will admit it. If Ukraine can drag Russia into a decade long conflict that wastes their country but ultimately sees Putin defeated then again, yes it will be worth it. If Russia occupies Ukraine and then attacks another country, NATO member or not, then you could say Nuclear war was inevitable and the only person / people responsible is Putin and Russians. They will become the new Nazis, a century will pass before they are allowed back into civilised world after millions, probably including us, have been killed. That’s the price of madmen being allowed to walk this earth in the nuclear age. There but for the grace of god (or Putin) go I and all that.
People keep saying 'millions' - why? It will be billions, if it goes full scale.....billions. Literally.