EU member states approved Thursday Bulgaria and Romania's full accession to the Schengen zone starting next year, ending a 13-year wait for the two eastern European nations, officials said.

"It is a historic moment to finally welcome Bulgaria and Romania," said Interior Minister Sandor Pinter of Hungary, whose country holds the EU's rotating presidency.

The two countries, both members of the European Union since 2007, were partially integrated into the free movement zone in March, opening up travel by air and sea without border checks.

But Austria held up their full entry over migration concerns, which meant that controls still applied at their land routes.

Vienna announced Monday that it would not use its veto at Thursday's meeting of EU ministers, paving the way for the two to become full members from Jan. 1, 2025.

Romania and Bulgaria "strongly" welcomed their full entry.

"This is a historic decision, marking the end of the process of accession of the two countries to the EU free movement area, a key objective of both Bulgaria and Romania since their accession to the European Union," the two countries said in a statement.

'Border protection package'

Bucharest and Sofia fulfilled all technical criteria set out by Brussels in 2010, but spent more than a decade waiting to join the Schengen zone as various member states blocked their entry.

Since 2022, their applications have been held up by Austria, which had for years complained about hosting a disproportionate number of undocumented immigrants as a result of poorly protected external Schengen borders.

Austria dropped its objections after the three countries signed a "border protection package" agreement in Budapest.

The agreement foresees the joint deployment of border guards to the Bulgarian-Turkish border and temporary border controls on land routes for an initial period of six months.

Romanian President Klaus Iohannis said Thursday's decision was a "recognition of our yearslong efforts and progress achieved."

"Romania assures that we will continue to act fully responsible for protecting and strengthening the EU's external borders," he said, adding that the country's Schengen accession would "strengthen EU security and unity."

Created in 1985, the Schengen zone currently comprises 29 members – 25 of the 27 European Union member states as well as Switzerland, Norway, Iceland and Liechtenstein.

It is the world's biggest area without internal border controls, where more than 400 million people can travel freely inside the zone.