Operation "Unthinkable": Churchill planned attack on Stalin in 1945

In May 1945, as Europeans celebrated the end of the war with Germany, British military staffs were developing a plan to attack Soviet forces — Operation "Unthinkable". The topic is discussed by Dr. Leszek Pietrzak in the book "Forbidden History of the Allies". The plan assumed a strike against the USSR to stop Stalin's expansion in Eastern Europe.