Cheers mate! We can kill 16 million civilians BEFORE the yanks kill all the rest!

On August 29, 1949 the USSR tested its first nuclear weapon at Semipalatinsk in Kazakhstan (see also Soviet atomic bomb project). Scientists in the United States from the Manhattan Project had warned that in time, the Soviet Union would certainly develop nuclear capabilities of its own. Nevertheless, the effect upon military thinking and planning in the US was dramatic, primarily due to the fact that American military strategists had not anticipated the Soviets would 'catch up' this soon. However, at this time, they had not discovered that the Russians had conducted significant espionage of the project from spies at Los Alamos, the most significant of which was done by the theoretical physicist Klaus Fuchs. The first Soviet bomb was more or less a deliberate copy of the Fat Man device.

With the monopoly over nuclear technology broken, world-wide nuclear proliferation accelerated. The United Kingdom tested its first atomic bomb in 1952, followed by France in 1960 and then the People's Republic of China in 1964. While much smaller than the arsenals of the USA and the USSR, Western Europe's nuclear reserves were nevertheless a significant factor in strategic planning during the Cold War. A top-secret white paper produced for the British Government in 1959, compiled by the Royal Air Force, estimated that British atomic bombers were capable of destroying key cities and military targets in the Soviet Union, with an estimated 16 million deaths in the USSR (half of whom were estimated to be killed on impact and the rest fatally injured) before bomber aircraft from the United States' Strategic Air Command reached their targets.
-http://en.wikipedia.org/wiki/Nuclear_war

Oh yeah, one other thing.

We'll all die too.