Britain's exit from the European Union was in disarray after the implosion of Prime Minister Theresa May's Brexit strategy left her under pressure from rival factions to leave without a deal, go for an election or forge a much softer divorce.

After one of the most tumultuous weeks in British politics since the 2016 referendum, it is still uncertain how, when or even if the United Kingdom will ever leave the bloc it first joined 46 years ago.

A third defeat of May's divorce deal, after her pledge to quit if it was passed, left one of the weakest leaders in a generation grappling with a perilous crisis over Brexit, the United Kingdom's most significant move since World War II.