Lots of people claiming that Putin-Ukraine reminds them of the 1938 Hitler crisis miss the point of their own analogy: a British-French war against Germany at that point would have been a disaster for them. Chamberlain knew it, that's why he conceded the Sudetenland Chamberlain, the British PM, knew that public opinion wouldn't be supportive of another great European war to stop ethnic Sudetenland Germans from joining Germany, two decades after the Austria empire was dismembered in the name of ethnic self-determination