Romanian centrist and leftist parties looked to have fended off a surge by the nationalist right in Sunday's parliamentary election, as attention turned to a top court ruling later on Monday on whether to annul the results of a presidential vote.

Romanians cast ballots Sunday in a parliamentary election sandwiched between a two-round presidential race, the first of which has plunged the European Union and NATO member into unprecedented turmoil following allegations of electoral violations and Russian interference.