British Brexit Secretary David Davis has said he is entering negotiations on the UK's exit from the EU in a positive and constructive frame of mind.
As he began talks in Brussels, he said he was determined to build a strong and special partnership with the EU.
The Chief EU negotiator said he wanted to agree key priorities and a timetable for discussions.
Subjects for the negotiations include the status of expats, the UK's divorce bill and the Northern Ireland border.
The UK is set to leave the EU by the end of March 2019 following last year's referendum vote.