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Poland's ruling Law and Justice party leader Jaroslaw Kaczynski has blamed European Council President Donald Tusk for Britain's vote to leave the EU, and called for him to disappear from European politics.
Mr Kaczynski told local media: "A particularly dark role was played by Donald Tusk, who conducted negotiations with the British and in fact contributed to them getting nothing.
"Hence, he is directly responsible for Brexit and should simply disappear from European politics. But this concerns the whole of European Commission in its present composition."
There will be no informal discussions between Britain and the EU before the British government invokes formal divorce proceedings by making the Article 50 request, a German government spokesman has said.
Steffen Seibert, spokesman for Chancellor Angela Merkel, told a news conference: "One thing is clear: before Britain has sent this request there will be no informal preliminary talks about the modalities of leaving."
Action must be taken to prevent other countries from fleeing the EU, German Chancellor Angela Merkel has said.
Speaking at a Christian Democratic Union party executive board meeting, Ms Merkel said the financial markets are very concerned that the EU is no longer governable.
She added that all 27 remaining EU countries must consult together on the way forward following Britain's vote to leave the bloc.
However, Ms Merkel maintained that it is not the right time to pursue a quick deepening of cooperation between eurozone member states.
Instead, the EU should act on popular concerns such as securing the bloc's borders, creating jobs and improving internal security, she said.
Britain will not automatically gain Swiss-style access to the single market outside the EU without the free movement elements, France's foreign minister Jean-Marc Ayrault has said.
Mr Ayrault added that Britain needs to decide who will represent the nation, so Europe can push ahead with Brexit arrangements.
"Absolutely Britain needs to sort out the problem of who represents it...from there we can work on an agenda and a calendar," he said.
Mr Ayrault's comment stands in contrast with that of leave campaigner Boris Johnson, who recently said in an article in The Telegraph that Britain would still maintain access to the single market after leaving the EU.
Britain should not be forced out the EU as quickly as possible, Poland's foreign minister Witold Waszczykowski has said.
"We need a longer reflection," Mr Waszczykowski told Polish state television TVP Info.
"This cannot be [a] hasty action, this cannot consist of forcing Britain out and as fast as possible."
Mr Waszczykowski said more should have been done to keep Britain in the bloc, adding that EU officials were partly responsible for Britain's vote to leave.
On Friday, Poland said the EU needed a new treaty to increase the role of sovereign nations and preserve the bloc's unity following the result of Britain's EU referendum.
France and Germany both believe Britain should proceed with plans to leave the EU speedily, French finance minister Michel Sapin has said.
"France like Germany says Britain has voted for Brexit," he said on France 2 television. "We cannot remain in an uncertain and indefinite situation."
Central banks are ready to cooperate to support financial stability in the wake of Britain's vote to leave the EU, the Bank for International Settlements has said.
During a meeting in Switzerland on Saturday, central bankers discussed the implications of Brexit.
"Governors endorsed the contingency measures put in place by the Bank of England and emphasised the preparedness of central banks to support the proper functioning of financial markets," said Agustín Carstens, chairman of the global economy meeting.
"Central banks will carefully monitor market functioning and stability, and cooperate closely."
German Chancellor Angela Merkel has said there is no rush for Britain to leave the EU, but it should not take too long.
However, European foreign ministers are calling on the UK to go quickly.
ITV News correspondent John Ray reports:
German Chancellor Angela Merkel has tempered calls for a "quick divorce" between Britain and the EU.
The Brexit result has prompted many EU leaders to pressure the UK into beginning the process immediately.
But Mrs Merkel has made clear she will not push Britain out the door, despite warnings hesitation will lead to growing instability.
"It should not take ages, that is true, but I would not fight now for a short time frame," she told a news conference.
"The negotiations must take place in a businesslike, good climate. Britain will remain a close partner, with which we are linked economically."
Latest ITV News reports
Foreign Secretary Philip Hammond said there will have to be a "trade-off" on UK access to the EU single market and migration controls.
France's foreign minister called for the UK to trigger the exit clause after a meeting with counterparts of the six EU founding states.