Updated August 20, 2024 at 11:00 a.m. The Soviet Union led Warsaw Pact troops in an invasion of Czechoslovakia on this day in 1968. Get This Happened straight to your inbox ✉️ each day! Sign up here. Why did the Soviet Union invade Czechoslovakia?The Soviet Union, along with other Warsaw Pact countries, invaded Czechoslovakia to suppress the reforms of the Prague Spring. The Prague Spring was a period of political liberalization and democratization led by Czechoslovak leader Alexander Dubček, which challenged Soviet influence and control. How long did the Soviet occupation of Czechoslovakia la…