Dubček, first secretary of the Central Committee of the Communist Party of Czechoslovakia, initiated the Prague Spring reforms
In the Soviet Union, it was considered to have a tendency to break away from Soviet control
In order to implement a unified "Soviet system"
The Soviet Union decided to intervene militarily in the Czech Republic
The Warsaw Pact held military exercises in the Czech Republic of China, and after the end of the exercises, it was delayed before withdrawing.
In 1968, Soviet troops invaded Czechoslovakia