With most votes counted Sandu had won 55%, and in a late-night speech she promised to be president for all Moldovans.

Her rival Alexandr Stoianoglo, who was backed by the pro-Russian Party of Socialists, had called for a closer relationship with Moscow.

During the day the president’s national security adviser said there had been “massive interference” from Russia in Moldova’s electoral process that had “high potential to distort the outcome”.

Russia had already denied meddling in the vote, which came a week after another key Eastern European election in Georgia, whose president said it had been a “Russian special operation”.