Oh, goodie, another forever war
Fighting for democracy over a totalitarian invader is always worth fighting for, even if it takes forever. When you roll over for dictators they just get more emboldened until they try to take something you won't give up. So you always end up fighting them sooner or later but sooner is always better.
If England and France had stood up to Hitler in 1936 when he re-entered the Rhineland, WW2 would have been shorter and a lot less bloody. But when they did nothing, Hitler realized that he could push for more. So then it was annexing Austria. Nothing from the British or French. Then it was the Sudetenland. Again nothing.
Then it was threatening to take all of Czechoslovakia, which the Brits and French thought they could treaty their way out of. But dictators like Hitler don't honor agreements and the Munich agreement basically ceded Czechoslovakia to him anyway. So he took it.
And then, finally, in 1939, 3 years after Hitler retook the Rhineland, he invaded Poland and this time, Britain and France couldn't just look the other way. But by then the German war machine was the biggest and baddest on the planet.
The time to kill a dictatorship is in the creche, before it outgrows your capacity to contain it. This is why the West should be arming Ukraine. It's why the West should be committing troops (especially Count Jr.) and calling Putin's bluff. Because at the moment, bluffing is all Putin can do. But once Trump lifts the sanctions and starts sharing US intelligence with Russia like the traitorous shit stain he is and always has been, the bad guys are going to win.