May in Brussels for moment of truth with EU

UK Prime Minister Theresa May was scheduled to meet European Commission President Jean-Claude Juncker on Monday for crunchtime talks that could determine whether Brexit negotiations can continue into a second phase.

Brussels has stipulated that "significant progress" must be reached on three key issues - namely the status of the border between Northern Ireland and the Republic of Ireland, citizens' rights, and the Brexit divorce bill - before negotiations on trade and the United Kingdom's future relationship with the European Union can begin.

Last year, the UK voted to leave the EU in a national referendum.