Britain's Prime Minister Theresa May reacts during a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May arrives for a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May leaves after a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May leaves after a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May speaks to the media during a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May speaks during a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May speaks during a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May smiles during a news conference at the European Union (EU) summit in Brussels, Belgium.

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Britain's Prime Minister Theresa May speaks during a news conference at the European Union (EU) summit in Brussels, Belgium.

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From left, Hungarian Prime Minister Viktor Orban, Austrian Chancellor Sebastian Kurz and German Chancellor Angela Merkel talk at the European Union (EU) summit in Brussels, Belgium.

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Italian Prime Minister Giuseppe Conte attends the European Union (EU) summit in Brussels, Belgium.

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Czech Republic's Prime Minister Andrej Babis, left, talks to Austria's Chancellor Sebastian Kurz at the European Union (EU) summit in Brussels, Belgium.

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From left, Poland's Prime Minister Mateusz Morawiecki, Austria's Chancellor Sebastian Kurz and Czech Republic's Prime Minister Andrej Babis talk at the European Union (EU) summit in Brussels, Belgium.

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European Commission President Jean-Claude Juncker, left, and Lithuanian President Dalia Grybauskaite attend the European Union (EU) summit in Brussels, Belgium.

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Lithuanian President Dalia Grybauskaite attends the European Union (EU) summit in Brussels, Belgium.

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From left, Poland's Prime Minister Mateusz Morawiecki, Austria's Chancellor Sebastian Kurz and Czech Republic's Prime Minister Andrej Babis talk at the European Union (EU) summit in Brussels, Belgium.

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European Union Foreign Policy Chief Federica Mogherini, centre, attends the European Union (EU) summit in Brussels, Belgium.

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Italian Prime Minister Giuseppe Conte arrives at the European Union (EU) summit in Brussels, Belgium.

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From left, Dutch Prime Minister Mark Rutte, Sweden's Prime Minister Stefan Lofven and European Commission President Jean-Claude Juncker talk at the European Union (EU) summit in Brussels, Belgium.

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Cypriot President Nicos Anastasiades, centre, smiles as he attends the European Union (EU) summit in Brussels, Belgium.

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Latvia's Prime Minister Maris Kucinskis, centre, attends the European Union (EU) summit in Brussels, Belgium.

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European Council President Donald Tusk arrives at the European Union (EU) summit in Brussels, Belgium.

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Austria's Chancellor Sebastian Kurz arrives at the European Union (EU) summit in Brussels, Belgium.

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From left, European Council President Donald Tusk, European Commission President Jean-Claude Juncker and Austria's Chancellor Sebastian Kurz talk at the European Union (EU) summit in Brussels, Belgium.

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Romanian President Klaus Iohannis arrives at the European Union (EU) summit in Brussels, Belgium.

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