The Soviet Union, having become the world's…

The Soviet Union, having become the world's second nuclear power, establishes the Warsaw Pact alliance, and enters into a struggle for global dominance, known as the Cold War, with the rivaling United States and NATO.

After Stalin's death in 1953 and a short period of collective rule, the new leader Nikita Khrushchev denounces Stalin and launches the policy of de-Stalinization, releasing many political prisoners from the Gulag labor camps.

The general easement of repressive policies will become known later as the Khrushchev Thaw.

In 1957, the Soviet Union launches the world's first artificial satellite, Sputnik 1, thus starting the Space Age.