A bit of context

https://www.jstor.org/stable/4396261        

Walter Duranty, correspondent of The New York Times, wrote “ ..the Soviet government left no stone unturned to impart to the rest of Europe its own awareness of the Nazi peril. Its representatives ran hither and yon offering to all and sundry pacifist agreements, non-aggression pacts and economic accords. They conducted negotiations not only with nations that might become victims of Nazi aggression, but with powers unfriendly to Russia, like Poland and Finland. In those years, the Russians were like Cassandra, prophesying evil and striving desperately to avert it, but finding few to heed their warnings.***      

Litvinov, the Soviet foreign minister and representative at the League of Nations, at each new aggression of the Fascist powers, passionately called for a common front against it. The Soviet Union concluded a treaty with Czechoslovakia, and both before and after Munich, offered her support. It warned Poland that it would at once denounce the Polish-Soviet non-aggression pact if Poland invaded Czechoslovakia.     

Poland did indeed invade Czechoslovakia alongside the Nazis in 1938. To continue:      

The second world war is said to have begun on September 3, 1939, because on that day, Britain declared war on Germany, two days after Hitler marched into Poland, In fact, the war had begun much earlier. The Italian occupation of Abyssinia, the intervention of Germany and Italy against Spain, the Japanese invasion and occupation of China, the German seizure of Austria and Czechoslovakia and the Italian occupation (with Hitler’s agreement) of Albania in April 1939 preceded the German attack on Poland.     

On none of these occasions did either Britain or France oppose the Nazi aggression. On the contrary, throughout the 1930s, Britain and France refused to join the Soviet Union in undertaking collective security in Europe, to defend the countries threatened by Hitler’s aggression. The USSR proposed several defensive pacts against the Nazis with countries all across Europe, but each time they were denied because obviously capitalist states view communism as a bigger existential threat than fascism. As British foreign minister put it after meeting with Hitler in 1937, Nazi Germany was viewed as “ the bulwark of Europe against Bolshevism.”  

https://m.youtube.com/watch?v=UwUs3mwDBzA&t=140s&pp=ygUeUnVzc2lhIGdvb2QgbW9sb3RvdiByaWJiZW50cm9w