Gains by far-right groupings in Sunday's parliamentary vote after a campaign dominated by voters' concerns over budget problems and the cost of living could upend Romania's pro-Western orientation and undermine support for Ukraine, political analysts said.

Romania is falling even more in turmoil after one election official touted at a potential rerun of the first round of presidential elections after a shocking result that allegedly was engineered with foreign interference.

Romania's top court on Thursday ordered a recount of votes in the first round of the presidential election and the country's top security body warned Romania was a key target for hostile actions from Russia after a shock result in the ballot.

The surprise far-right winner of the first round of Romania's presidential election has denied he wants to leave NATO and the European Union, appearing to roll back some of his positions amid protests over his victory.

Romania's top court ordered a vote recount in the first round of the presidential election, it said on Thursday, in a ruling observers said risked tarnishing the credibility of state institutions ahead of two more ballots.