Romanian, Portuguese and Polish nationals have been casting their ballots, with millions of Europeans taking to the polls on Sunday.

Romania's European allies and markets welcomed centrist Nicusor Dan's presidential election victory over the eurosceptic hard-right on Sunday, relieved that the European Union member avoided a lurch to a Donald Trump-inspired political path.

Romania passed a major test for its young democracy as a centrist independent won the race for president, withstanding a surge of the far right.