1938: "Just give him the parts of Czechoslovakia he wants. Yeah, annexing a part of other country is wrong, but a minority speaking his language lives there, so, uhm, he kinda has a good reason. More importantly, we have a good reason to believe he will stop there. Just let's not be the bad guys who fight over nothing. Everything will be fine when he gets what he wants, he is a reasonable guy."
2014: "Just give him the parts of Ukraine he wants. Yeah, annexing a part of other country is wrong, but a minority speaking his language lives there, so, uhm, he kinda has a good reason. More importantly, we have a good reason to believe he will stop there. Just let's not be the bad guys who fight over nothing. Everything will be fine when he gets what he wants, he is a reasonable guy."
The analogies are much deeper here than merely "he is a guy we don't like, therefore Hitler". Things that happen inside Russia are also very disturbing -- I am trying to ignore politics, and I usually don't care about what happens in Russia, but some news still get to me -- Putin's supporters are openly nationalist, racist, homophobic, pretty much everything you associate with fascism, he has a strong support of the Orthodox Church, journalists who criticize him are assassinated. (Someone living in Russia would be more qualified to write about this.) The only way he could lose an election would be against someone who is even more like this. Winning a symbolic war against the West will only make him more popular.
To test how strong is this analogy, we should make bets like: Conditional on Putin successfully annexing a part of territory of Ukraine, what is the probability of Russia attacking another country within 1, 3, 5, 10 years? Which country will it be?
Putin's supporters are openly nationalist, racist, homophobic,
Would you mind tabooing what you mean by "racist" (and possibly also "nationalist" and "homophobic") and why your definition is bad, there is currently a long debate in another thread on this very subject.
Some of the comments on the link by James_Miller exactly six months ago provided very specific estimates of how the events might turn out:
James_Miller:
Me:
"Russians intervening militarily" could be anything from posturing to weapon shipments to a surgical strike to a Czechoslovakia-style tank-roll or Afghanistan invasion. My guess that the odds of the latter is below 5%.
A bet between James_Miller and solipsist:
I will bet you $20 U.S. (mine) vs $100 (yours) that Russian tanks will be involved in combat in the Ukraine within 60 days. So in 60 days I will pay you $20 if I lose the bet, but you pay me $100 if I win.
While it is hard to do any meaningful calibration based on a single event, there must be lessons to learn from it. Given that Russian armored columns are said to capture key Ukrainian towns today, the first part of James_Miller's prediction has come true, even if it took 3 times longer than he estimated.
Note that even the most pessimistic person in that conversation (James) was probably too optimistic. My estimate of 5% appears way too low in retrospect, and I would probably bump it to 50% for a similar event in the future.
Now, given that the first prediction came true, how would one reevaluate the odds of the two further escalations he listed? I still feel that there is no way there will be a "conventional battle" between Russia and NATO, but having just been proven wrong makes me doubt my assumptions. If anything, maybe I should give more weight to what James_Miller (or at least Dan Carlin) has to say on the issue. And if I had any skin in the game, I would probably be even more cautious.