I came across this document this evening when looking at The Corner. It is Operation Unthinkable -- the British review for war with Stalin's USSR following World War Two.
The topic of Western Betrayal is still a hot topic in eastern Europe. Many Eastern Europeans feel that the Western powers sold them out to the Soviet Union following World War Two, replacing Nazism with Bolshevism. This feeling is especially strong in Poland, for whom the Western powers ostensibly went to war to defend in 1939. The Poles suffered heavily during World War II, initially suffering German invasion. Later, much of the Polish intelligentsia was wiped out when 23,000 Polish officers were executed by the Soviets at Katyn. Warsaw rose in revolt twice. First, the Jews revolted in 1943. Then, as the Soviet armies neared the city, the Polish Home Army turned on the Germans. The Soviet advance was halted, while the Poles died in large numbers fighting the Germans. The Soviets not only refused to militarily assist the Poles, but they forbid Western assistance.
In the end, Poland found itself at the feet of Stalin.
The problem with Western Betrayal is that in reality there was little the Western allies could do. The British Empire was bankrupt and exhausted. The United States still had to defeat Japan, and in any event, there was no will to turn on our Russian "allies" in the hour of victory. FDR and Churchill were able to get Stalin to agree to free elections -- of course that turned out to be a farce.
Short of the Western Allies going to war with Russia, Poland's fate, and the fate of all of Eastern Europe, was sealed.