REUTERS

A corresponding letter from British Prime Minister Theresa May, triggering Article 50 of the Lisbon treaty, was delivered to Donald Tusk, the European Council President Donald Tusk, according to BBC News.

This way, the UK formally begins a two-year process of leaving the EU.

Read alsoScottish lawmakers back call for independence vote – mediaTheresa May has until late March 2019 to settle all conditions of her country's withdrawal from the European Union.

Following financial and migration crises which the European Union seems to have tackled, Brexit is the most significant blow to the organization over its 60-year history.