Theresa May has promised vowed the UK will remain a strong partner to the EU on arrival at her first European Council summit in Brussels.
May also called for unity in pressuring Russia for its "sickening atrocities" in Syria.
“The UK is leaving the EU but we will continue to play a full role until we leave and we'll be a strong and dependable partner after we have left," she told reporters upon arrival.
Council president Donald Tusk dismissed prospects of a clash between May and other leaders.
"Some media described her first meeting in the European Council as entering the lion's den," he said.
"It is not true. It is more like a nest of doves – just look at me!”
And German Chancellor Angela Merkel played down the Brexit issue, saying that a discussion on the UK's departure from the EU at a working dinner later tonight was expected to be brief.