It is up to the EU to decide when Brexit negotiations can move on to the next phase.
After three rounds of talks, what has been agreed and what are the big sticking points?
The European Commission has published its guidelines for talks on this thorny issue.
The story of the first ascent of Annapurna offers a remarkable insight into today's European relations.
The balance of power in Brexit talks is firmly with the EU.
Two Germans, a Frenchman and a Belgian: who to watch as negotiations with the UK begin.