The guidelines state that the European Union will "give priority to an orderly withdrawal", and will take a phased approach, with the first phase aiming to settle the terms of the UK's removal from the rights and obligations derived from membership and to provide "as much clarity and legal certainty as possible" to citizens and businesses.
But that concession to Theresa May two days after she triggered a two-year countdown to withdrawal was accompanied by elements in the draft that the British prime minister may find less palatable.
The House of Lords said in a report published earlier this month that the job of adapting the European Union regulations into British law is complicated by the "scale and complexity of the task", as well the fact that some decisions will be dependent on the result of Britain's negotiations with the EU.
"Starting parallel talks on all issues at the same time, as suggested by some in the United Kingdom, will not happen", he said, adding that the EU-27 will assess "probably [in] the autumn if sufficient progress has been achieved".
Germany says the question of Britain's commitments toward the European Union after it leaves the bloc needs to be resolved before talks about future relations with the United Kingdom can begin.
But the guidelines, seen by BuzzFeed News, will demand for negotiations to be phased, with the first phase addressing the disentanglement of the United Kingdom from the union.
Tusk said the bloc needed to think of people first.
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After forceful lobbying by Irish officials in Brussels, European Council president Donald Tusk's document is expected to reference Brexit challenges for Ireland - which include cross-Border trade and the peace process.
He said: "What she said was that if we don't have a deal, it's not good for either side".
It has been sent to European leaders ahead of a summit of leaders in Brussels on April 29, and will act as a framework on which the European Commission can base its detailed negotiation stance over the next two years.
The guidelines also say the issue of citizens living in each other's countries is a priority, and call for "flexible and imaginative solutions" for the issue of the U.K.'s land border with Ireland. Talks should not only be about the terms of Britain's exit but also about future ties, he insisted. "But paradoxically there is something positive in Brexit", Tusk added.
Prime Minister Theresa May has officially notified the European Union of the U.K.'s intention to withdraw.
Federica Mogherini, arriving in Brussels for a meeting of North Atlantic Treaty Organisation foreign ministers, said Britain was providing 3 percent of the EU's foreign civilian missions and 5 percent of the military ones.
But he added: "As of Wednesday, it's acceptable even in cautious EU language to refer to a meeting of 27 leaders as European Council". However, her proposal for simultaneous divorce and trade talks suffered an nearly instant setback after German Chancellor Angela Merkel insisted they can not run in parallel.