The Czech Republic is commemorating the 50th anniversary of the Soviet-led invasion in Czechoslovakia in 1968.
An hour before midnight on 20 August,1968, Soviet-led tanks and troops invaded Czechoslovakia enacted in the brief era known as the Prague Spring.
The move was met with mass protests and deadly street battles between civilians and Warsaw Pact country soldiers.
The result would be more than 20 years of occupation by the Soviet Union.
Soviet troops withdrew only after the anti-communist 1989 Velvet Revolution.