Prime Minister Boris Johnson on Friday hailed "a new chapter" in Britain's history as he signed its divorce deal with the EU, clearing another hurdle ahead of the country's departure from the bloc next Friday.
Johnson signed the agreement in Downing Street in front of European and British Foreign Office officials who had brought it from Brussels.
EU chiefs Ursula von der Leyen and Charles Michel had put their names to the treaty at a ceremony held behind closed doors in the dead of night.
"The signing of the withdrawal agreement is a fantastic moment, which finally delivers the result of the 2016 referendum and brings to an end far too many years of argument and division," Johnson said in a statement.
"This signature heralds a new chapter in our nation's history," he added on Twitter.
The treaty will now return to Brussels, where the original will be kept in EU archives along with other international treaties, while three copies will be dispatched back to London.
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On Wednesday next week, the text will go to the European Parliament for ratification and on Thursday diplomats from the EU member states will approve the deal in writing.
Then, on Friday, January 31, Britain spends its last day in the EU before leaving the bloc at 2300 GMT as clocks strike midnight in Brussels.
"Charles Michel and I have just signed the agreement on the withdrawal of the UK from the EU, opening the way for its ratification by the European Parliament," European Commission president Von der Leyen tweeted.
In a separate tweet, European Council president Michel said: "Things will inevitably change but our friendship will remain. We start a new chapter as partners and allies."
The former Belgian premier, whose council represents EU member governments, added, in French: "I'm keen to write this new page together."