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epa06962871 A boy walks past tank sculpture by Czech artist David Cerny in Prague, Czech Republic, 21 August 2018. Czech and Slovak people mark on 21 August the 50th anniversary of the Soviet-led invasion in Czechoslovakia in 1968 that crushed the liberal reforms and ended an era known as the 'Prague Spring'. Soviet troops occupied Czechoslovakia until 1990. EPA/MARTIN DIVISEK