UK Prime Minister Theresa May is due at a summit in Brussels, hours after conservative rebels in the House of Commons defeated the government in a key Brexit vote.
On the eve of the summit, Mrs May suffered her first commons defeat as Prime Minister by just four votes, as MPs backed an amendment to the EU withdrawal bill by 309 to 305.
Labour leader Jeremy Corbyn said it was a “humiliating loss of authority” for the Prime Minister.
Unless it is overturned by the government at a later stage, it means MPs will get to vote on the final deal reached with Brussels before it is ratified.
Other EU member states could decide to move forward to trade talks with the UK at their two-day summit.
The negotiations are first expected to focus on agreeing a temporary arrangement that will begin as soon as the UK leaves the EU in March 2019.