1.From the moment Hitler came to power, this is exactly what the USSR was doing - trying to create an anti-Hitler coalition. But the West (Hitler's natural ally, by the way) did everything to allow Germany to strengthen and arm itself, namely, gave loans, looked away when the Nazis armed themselves and seized land, and when the war started to run it as “The Strange War” One of the main goals of this sneaky and stupid (as it turned out) policy was to direct Germany towards the USSR, especially since this was the task of the Nazis, openly proclaimed in “Mein Kampf”.
Ah, is the translation software not working well today, Ivan? What you are referring to is the period known as the "Phony War", between October 1939 (when Poland surrendered) and Spring 1940, when Hitler moved West in earnest. The problem here was that France had spent their military money on defensive measures like the Maginot Line instead of on tanks and planes to conduct offensive operations.
Your argument makes no sense, really. The west didn't enforce the provisions of the Versailles treaty because by the middle of the 1930s, even they realized that it had pushed Germany into fascism. They had also spent most of the 1920s disarming and redirecting funds into social programs.
The real problem was that when Hitler broke his promises at Munich to only claim the Sudetenland (and ended up dismembering the rest of Czechoslovakia), Chamberlain decided to write a blank check to the Polish Colonels instead of encouraging them to negotiate with Germany in good faith on territories that were in fact, German. He wasn't in any position to cash that check, that was the problem, any more than he was capable of supporting the Czechs.
2. Stalin was the last person in Europe who signed such an agreement with Hitler. Everyone else had already done so. And he signed it after it became obvious in the summer of 1939 that England and France did not want to conclude an anti-Hitler treaty and even more so, an alliance between these states and Hitler was quite possible.
By signing the agreement, the USSR received a two-year reprieve to prepare for war. They did everything they could, considering that at the end of the 20s the USSR did not have many types of industry.
Actually, Stalin had been cutting dodgy deals with the Germans all along. See the treaty of Rapallo, where the German government (still pre-Nazi) cut a deal to help Stalin train his army.
3. The opposite happened. Socialist state and capitalist states became Allies, and Hitler got a war on two fronts. Before Hitler's attack it was important to know on which side the USA would be and for this purpose it was necessary not to become an aggressor, that is why the policy of preventing the possibility of giving a formal reason for war with Hitler was carried out. Hitler attacked, became the aggressor and the U.S. was forced to act on Truman's June 1941 statement: “If we see Russia winning, we will help Germany and vice versa. And let them fight and kill each other as much as possible.”
Truman wasn't President in 1941. It is also unlikely that he said that at all, at least not in public.
But let's look at this. Why would the West in 1939 be reluctant to side with Russia over Germany?
Well, at that point, Hitler hadn't done anything all that bad. Most Austrians wanted the
Anschluss. Austria was floundering, not being part of a bigger empire. True, he backstabbed the West at Munich by breaking most of his promises.
MEANWHILE, Stalin had murdered millions of people (not tens of millions like the idiot birchers say, but millions) either through famine or direct murder. He was funding Communist revolutionary groups worldwide through the "Third International". (which is why the Axis called itself the "Anti-Commintern Pact")
At the height of 1940, Stalin even wanted to join the Axis (obviously not getting what the name meant) and von Ribbontrop was all for it. The only reason he couldn't talk Hitler into it is Hitler saw Bolshevism as a "Jewish" movement. He was engaging in aggressive actions in the Far East, challenging Japan for control of China.