Romanians vote in a presidential election runoff on Sunday that could see Calin Georgescu, a far-right critic of NATO, defeat pro-European centrist Elena Lasconi, an outcome that might isolate Romania in the West and erode its support for Ukraine.

A top Romanian court has validated the first round of a presidential race in which a far-right outsider emerged as the frontrunner, plunging the country into a week of turmoil amid allegations of electoral violations and Russian meddling.

A hard-right critic of NATO who has praised Russia is set to face a center-right opposition leader in a presidential election runoff in Romania that could undermine its pro-Western stance after a shock outcome in the first-round vote.