In April 1978 , communists in Afghanistan had taken over the government by force using violence and killing its Muslim leaders
By 1979, the Mujahideen had been formed by Islamic extremists to wage jihad against the communist government - In December 1979, Leonid Brezhnev , the leader of the Soviet Union, sent 50,000 Soviet troops to protect the communists
The Soviet invasion of Afghanistan was a shock to the USA , who had spent many years improving relations with the Soviet Union - The USA, China and United Nations immediately condemned the actions of the Soviet Union