Theresa May posed for a photo in a show of unity with other EU leaders at her first EU summit on Thursday, despite having declared she had a "very clear message" for them that Britain will quit the bloc.
It came on a day when sterling fell against the dollar after the president of the European Council said EU leaders would not engage in Brexit negotiations.
Donald Tusk said he expected Mrs May to brief the other 27 leaders later, but ruled out negotiations until the prime minister formally launches the Brexit process, which she has said will happen by the end of March next year.
Canada's free trade deal could be the last for the EU, the bloc's President Donald Tusk said.
The CETA deal with Canada is being delayed after one regional parliament in Belgium vetoed it and voiced concerns over some its terms.
Arriving for the summit, which the prime minister is also attending, Tusk said Brexit will not be discussed.
Trade will be a major issue at the two-day EU summit in Brussels, which begins today.
Tusk warned the CETA deal risked being the last such accord for the bloc unless it improves its trade policies.
The UK will be a "strong dependable partner" for the EU even after Brexit, Theresa May said at her first European Council meeting.
The prime minister said Britain must show a "robust and united European stance in the face of Russian aggression" in Syria.
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