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European Council President Donald Tusk addresses a press conference after receiving British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty by Britain's ambassador to the EU, in Brussels on March 29, 2017. 
Britain formally launches the process for leaving the European Union on Wednesday, a historic step that has divided the country and thrown into question the future of the European unity project. / AFP PHOTO / Emmanuel DUNAND        (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
European Council President Donald Tusk addresses a press conference after receiving British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty by Britain's ambassador to the EU, in Brussels on March 29, 2017. 
Britain formally launches the process for leaving the European Union on Wednesday, a historic step that has divided the country and thrown into question the future of the European unity project. / AFP PHOTO / Emmanuel DUNAND        (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)

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European Council President Donald Tusk makes a speech after the UK formally triggered Brexit.

Donald Tusk to UK: 'We already miss you'

European Council President Donald Tusk makes a speech after the UK formally triggered Brexit.