Actually it is backwards the real, real what if was Munich, Czechoslovakia had a mutual defense pact with the Soviets and France, It was the conservative government of Chamberlain that pressured the French to abandon them to Hitler and that freaked out Stalin, Poland's own contribution was participating in the invasion of Czechoslovakia and in not allowing the Red Army to pass through their territory and protect them (assuming the Munich agreement never passed). Afterwards Stalin was paranoid about the blue-black alliance and created the red-black alliance, his idiocy was in denial about the buildup and literally being caught with his pants down despite all the evidence to the contrary. But he was the first to take Hitler seriously and negotiated drawing a collective line in the sand, it was the only thing that would have prevented or shortened WWII significantly.
Chamberlain resigned after the Norway fiasco, his only saving grace was during the darkest hour where he tilted the needle against Halifax that wanted to surrender. But he was the first coward and history surprisingly does remember him, except for the part that he was a fascist appeaser not just "naive". I wonder how MAGA would have rebranded him today, probably a hero for and Hitler a pro peace leader as well.