It's the same why US and other western countries called for Russia's sanctions and boycott. USSR was in a precarious state. Stalin offered help UK and Europe several times to form a coalition against Nazis. Britain did Munich pact which permanently sealed the fate for the world. The policy of appeasement was very active in these years. That's why USSR had to make a deal out of it. Even Putin agrees with it. Though he has his criticism about Purges in military but he is sure of the Non aggression. Pact.
It's the same why US and other western countries called for Russia's sanctions and boycott. USSR was in a precarious state. Stalin offered help UK and Europe several times to form a coalition against Nazis. Britain did Munich pact which permanently sealed the fate for the world. The policy of appeasement was very active in these years. That's why USSR had to make a deal out of it. Even Putin agrees with it. Though he has his criticism about Purges in military but he is sure of the Non aggression. Pact.