Romania's defeated hard-right presidential contender George Simion said late on Tuesday that he would challenge the ballot's result, alleging interference by France and Moldova, after a centrist victory was met with relief by many European leaders.

Nicusor Dan, the mayor of Bucharest, defeated George Simion, a nationalist aligned with President Trump who had been seen as the front-runner.

Romania passed a major test for its young democracy as a centrist independent won the race for president, withstanding a surge of the far right.