The war was between the former Soviet Union and Afghanistan, started when the Soviet Union invaded Afghanistan in 1979.
Soviet Union
The Korean war was fought against North Koreans and Russian servicemen.
Soviet Union and United States
the cold war
Joseph Stalin fought for the Soviet Union in WWII.
Mujahideen
There was three, The USA, Britain, and the Soviet Union
Georgia
The Soviet Union fought a war in Afghanistan as an ally of the then Afghan government. The United States armed the Islamist insurgents in alliance with Pakistan.
During World War II, the Battle of Krusk was fought. It involved Soviet Union and German forces, with a Soviet victory.
The Soviet Union (USSR) supplied North Vietnam, and the US fought for South Vietnam.
United States, United Kingdom, Soviet Union