People in most countries around the world did not like what the Soviets were doing in Afghanistan. They liked how the Afghans were fighting them. Some reactions were very serious. US President Jimmy Carter said that the Soviet action was "the most serious threat to the peace since the Second World War". Carter threatened to boycott the 1980 Olympic Games in Moscow unless the Soviet Union withdrew its forces by February 1980. It did not do this and so the US boycotted the Games.