Romania returns to the polls in May for a rerun of its crunch presidential election after the original vote last year was annulled – and its shock far-right winner disbarred – amid widespread concerns over Russian interference and other irregularities. With another far-right candidate ahead in the polls, the vote is being watched from Brussels to Washington: a nationalist victory could result in the EU and Nato member, which borders Ukraine, veering from a pro-European path. The Trump administration, meanwhile, has accused Bucharest of overturning democracy. Why is the vote being rerun? The first round of Romania’s presidential election last...