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epa06255938 YEARENDER 2017 MARCH.European Council President Donald Tusk holds the letter giving Britain's official notice under Article 50 of the Lisbon Treaty to leave the European Union as he makes a statement at the EU Council in Brussels, Belgium, 29 March 2017. British Prime Minister Theresa May signed the letter giving official notice under Article 50 of the Lisbon Treaty, which was delivered to Donald Tusk by the British ambassador to the EU, Sir Tim Barrow on 29 March 2017. EPA/OLIVIER HOSLET