The decision came days after the government asserted that there had been “cyberattacks” meant to undermine the vote and security council documents indicated possible Russian meddling.

Romania’s Constitutional Court on Friday canceled the final round of a pivotal presidential election with only two days before the vote, saying it needed to ensure the “correctness of the electoral process.”

The surprise decision, in a NATO member state that shares a border with Ukraine, came days after Romanian leaders raised allegations that “cyberattacks” had tried to undermine the vote. The court’s ruling was also the latest in a series of political upheavals across Europe, where right-wing and nationalist movements have surged this year.