THE EUROPEAN UNION HAS AGREED TO MOVE TALKS FORWARD WITH LONDON ON BRITAIN'S EXIT FROM THE EU.
But there was little clarity on trade, as well as on some issues already discussed.
On the second day of a Brussels summit, EU leaders agreed "sufficient progress" was made after a deal on citizens' rights, the Irish border and Britain's outstanding payments, giving negotiators a mandate to move on to the main phase of talks.
"EU leaders agree to move on to the second phase of Brexit talks. Congratulations PM Theresa May," European Council President Donald Tusk, who chairs EU summits, said on Twitter.
Discussion of a transition period to calm nerves among businesses is due to start in the new year, although talks on a future free trade pact will not begin until after March -- a date underlined by "guidelines" that set out how to proceed as Britain seeks to unravel more than 40 years of membership.
May replied via Twitter, thanking Tusk and European Commission President Jean-Claude Juncker: "Today is an important step on the road to delivering a smooth and orderly Brexit and forging our deep and special future partnership," May said.
"We will deliver on the will of the British people and get the best Brexit deal for our country - securing the greatest possible access to European markets, boosting free trade with countries across the world, and delivering control over our borders, laws and money," she added.
However, the future partnership discussion is set to be difficult, leaders including Juncker and Italy's Prime Minister Paolo Gentiloni warned earlier, as they arrived for the second day of the summit. May had departed the night before.
Austrian Chancellor Christian Kern went further, saying even a primary school student could see that the "first phase" deal on the Irish border would come back to haunt the talks because it was impossible for Britain to leave the bloc's single market while avoiding a hard border on the island of Ireland.
"There cannot be any border controls between Northern and southern Ireland, there cannot be border controls between Northern Ireland and the UK, but there can between UK and the EU," he said.
"So our primary school students can see that there is a riddle to be solved."
In more formal language, leaders used the nine-point guidelines they agreed at the summit to support May's call for a two-year transition out of the bloc, which aims to help British business and citizens adjust to life after the European Union.