Slovakia election pits a pro-Russia former prime minister against a liberal pro-West newcomer

Voters in Slovakia cast ballots Saturday in an early parliamentary election that pits a populist former prime minister who campaigned on a pro-Russia and anti-American message against a liberal, pro-West newcomer.

Depending on which of them prevails, the election could reverse the small eastern European country’s support for neighboring Ukraine in the war with Russia, threatening to break a fragile unity in the European Union and NATO.

Former Prime MInister Robert Fico, 59, and his leftist Smer, or Direction, party have vowed to withdraw Slovakia’s military support for Ukraine in Russia’s war, if his attempt...