and deported over 20,000 people to Siberia As a result of the Yalta Conference, Czechoslovakia came under the influence and later under direct occupation of the Soviet Union and its Warsaw Pact, after a coup in 1948. Eight thousand two hundred and forty people went to forced labour camps in 1948–1953. In 1968, following the Prague Spring, the country was invaded by the Warsaw Pact forces (People's Republic of Bulgaria, People's Republic of Hungary, People's Republic of Poland, and Soviet Union, with the exception of Socialist Republic of Romania and People's Socialist Republic of Albania), ending a period of liberalisation under the leadership of Alexander Dubček. 137 Czechoslovak civilians were killed and 500 seriously wounded during the occupation. In 1969, Czechoslovakia became a federation of the Czech Socialist Republic and the Slovak Socialist Republic in the Czechoslovak Socialist Republic. It became a puppet state of the Soviet Union, but it was never part of the Soviet Union and remained independent to a certain degree. Borders with the West were protected by the Iron Curtain. About 600 people, men, women, and children, were killed on the Czechoslovak border with Austria and West Germany between 1948 and 1989. Dissolution of Czechoslovakia (1989–1992) The end of Communist rule in Czechoslovakia in 1989, during the peaceful Velvet Revolution, was followed once again by the country's dissolution, this time into two successor states. The word "socialist" was dropped in the names of the two republics, with the Slovak Socialist Republic renamed as Slovak Republic. On 17 July 1992, Slovakia, led by Prime Minister Vladimír Mečiar, declared itself a sovereign state, meaning that its laws took precedence over those of the federal government. Throughout the autumn of 1992, Mečiar and Czech Prime Minister Václav Klaus negotiated the details for disbanding the federation. In November, the federal parliament voted to dissolve the country officially on 31 December 1992. Slovak Republic (1993–present) The Slovak Republic and the Czech Republic went their separate ways after 1 January 1993, an event sometimes called the Velvet Divorce. Slovakia has, nevertheless, remained a close partner with the Czech Republic. Both countries co-operate with Hungary and Poland in the Visegrád Group. Slovakia became a member of NATO on 29 March 2004 and of the European Union on 1 May 2004. On 1 January 2009, Slovakia adopted the Euro as its national currency. In 2019, Zuzana Čaputová became Slovakia's first female president. Geography Slovakia