Slovaks are voting in a parliamentary election on Saturday, a knife-edge vote that could radically reshape Slovakia’s approach to Ukraine and create deep rifts within NATO and the European Union.

The frontrunner, former Prime Minister Robert Fico, has made no secret of his affinity for the Kremlin during the election campaign. He has criticized the West for supporting Ukraine and adopted a strong anti-US message, even accusing Slovakia’s President Zuzana Čaputová of being an “American agent.” He has said that if elected, he would stop sending weapons to Ukraine and block Ukraine’s NATO ambitions.

Fico’s left-wing populist SMER party has been leading for months, although opinion polls published earlier this week showed SMER neck-and-neck with the Progressive Slovakia (PS) party.