Great Britain was actually quite sympathetic to the Soviet cause during the 1930's, and actually sent aid after the Russian Revolution to help them establish an industrial base. During the World War II, they were perceived as necessary allies to defeat Nazi Germany. During the ensuing Cold War, Britain, now having lost its Empire and in a much reduced political and economic state, could not afford to challenge the Soviet Union. Rather, they acted as intermediaries for the United States, which had armed Britain with missiles to curb any ideas of Soviet expansion into Western Europe. In short, during the Cold War, Britain had much to lose and little to gain by speaking out against the Soviet Union; the US instead did it for them.