The Soviet invasion of Czechoslovakia resulted in Soviet Leaders replacing the reform-minded Czech officials. Thus Option 1. is the correct statement.
Why the invasion of Czechoslovakia was significant?
The Soviet invasion of Czechoslovakia was significant in the sense that it delayed the breakup of the Eastern European Communist Party and ended without causing any direct intervention from the West.
137 Czechoslovakia residents were killed and 500 seriously injured in the start.
The attack halted Alexander Dubček's revolutionary reforms in Prague Spring and strengthened the Czechoslovak Communist Party (KSČ).
Hence, Option 1. is the correct answer.
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