CHISINAU, Moldova — Moldovans cast votes in a decisive presidential runoff Sunday that pits pro-Western incumbent Maia Sandu against a Russia-friendly opponent, as ongoing claims of voter fraud, electoral interference, and intimidation threaten democracy in the European Union candidate country.

In the first round held Oct. 20, Sandu obtained 42% of the ballot but failed to win an outright majority. She faces Alexandr Stoianoglo, a former prosecutor general, who outperformed polls in the first round with almost 26% of the vote.

Polling stations will close at 9 p.m. (1900 GMT). By 5 p.m., more than 1.4 million people - almost 47% of eligible voters - had cast ballots, according to the Central Electoral Commission.

A poll released by research company iData indicates a tight race that leans toward a narrow Sandu victory, an outcome that might rely on Moldova’s large diaspora. The presidential role carries significant powers in areas such as foreign policy and national security and has a four-year term.

Moldova’s diaspora played a key role in a nationwide referendum also held on Oct. 20, when a narrow majority of 50.35% voted to secure Moldova’s path toward EU membership. But the results of the ballots including Sunday’s vote have been overshadowed by allegations of a major vote-buying scheme and voter intimidation.

Instead of winning the overwhelming support that Sandu had hoped, the results in both races exposed Moldova’s judiciary as unable to adequately protect the democratic process.

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PHOTOS: Moldovans choose president in decisive runoff overshadowed by fraud and intimidation claims

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On Sunday, Moldovan police said they have “reasonable evidence” of organized transportation of voters - illegal under the country’s electoral code - to polling stations from within the country and from overseas, and are “investigating and registering evidence in connection with air transport activities from Russia to Belarus, Azerbaijan and Turkey.”

“Such measures are taken to protect the integrity of the electoral process and to ensure that every citizen’s vote is cast freely without undue pressure or influence,” police said.

Stanislav Secrieru, the president’s national security adviser, wrote on X: “We are seeing massive interference by Russia in our electoral process,” which he warned had a “high potential to distort the outcome” of the vote.

Moldova’s Prime Minister Dorin Recean said that people throughout the country had received “anonymous death threats via phone calls” in what he called “an extreme attack” to scare voters in the former Soviet republic, which has a population of about 2.5 million people.

“These acts of intimidation have only one purpose: to create panic and fear,” Recean said in a statement. “I assure you that state institutions will ensure order and protect citizens.”

After casting her ballot in Chisinau, Sandu said “today, more than ever, we must be united, keep our peace, keep our vote, keep our independence”.

“Thieves want to buy our vote, thieves want to buy our country, but the power of the people is infinitely greater,” she told reporters.

Outside a polling station in Romania’s capital, Bucharest, 20-year-old medical student Silviana Zestrea said the runoff would be a “definitive step” toward Moldova’s future.

“People need to understand that we have to choose a true candidate that will fulfill our expectations,” she said. “Because I think even if we are a diaspora now, none of us actually wanted to leave.”

In the wake of the two October votes, Moldovan law enforcement said that a vote-buying scheme was orchestrated by Ilan Shor, an exiled oligarch who lives in Russia and was convicted in absentia last year of fraud and money laundering. Shor denies any wrongdoing.

Prosecutors say $39 million was paid to more than 130,000 recipients through an internationally sanctioned Russian bank to voters between September and October. Anti-corruption authorities have conducted hundreds of searches and seized over $2.7 million (2.5 million euros) in cash as they attempt to crack down.

In one case in Gagauzia, an autonomous part of Moldova where only 5% voted in favor of the EU, a physician was detained after allegedly coercing 25 residents of a home for older adults to vote for a candidate they did not choose. Police said they obtained “conclusive evidence,” including financial transfers from the same Russian bank.

On Saturday at a church in Comrat, the capital of Gagauzia, Father Vasilii told The Associated Press that he’s urged people to go and vote because it’s a “civic obligation” and that they do not name any candidates.

“We use the goods the country offers us - light, gas,” he said. “Whether we like what the government does or not, we must go and vote. … The church always prays for peace.”

On Thursday, prosecutors raided a political party headquarters and said 12 people were suspected of paying voters to select a candidate in the presidential race. A criminal case was also opened in which 40 state agency employees were suspected of taking electoral bribes.

Cristian Cantir, a Moldovan associate professor of international relations at Oakland University, told the AP that whatever the outcome of the second round, it “will not deflate” geopolitical tensions. “On the contrary, I expect geopolitical polarization to be amplified by the campaign for the 2025 legislative elections.”

Moldovan law enforcement needs more resources and better-trained staff working at a faster pace to tackle voter fraud, he added, to “create an environment in which anyone tempted to either buy or sell votes knows there will be clear and fast consequences.”

Savlina Adasan, a 21-year-old economics student in Bucharest, says she voted for Sandu and cited concerns about corruption and voters uninformed about the two candidates.

“We want a European future for our country,” she said, adding that it offers “many opportunities, development for our country … and I feel like if the other candidate wins, then it means that we are going ten steps back as a country.”

A pro-Western government has been in power in Moldova since 2021, and a parliamentary election will be held in 2025. Moldova watchers warn that next year’s vote could be Moscow’s main target.

In the wake of Russia’s invasion of Ukraine in 2022, Moldova applied to join the EU. It was granted candidate status in June of that year, and in summer 2024, Brussels agreed to start membership negotiations. The sharp Westward shift irked Moscow and significantly soured relations with Chisinau.

Since then, Moldovan authorities have repeatedly accused Russia of waging a vast “hybrid war,” from sprawling disinformation campaigns to protests by pro-Russia parties to vote-buying schemes that undermine countrywide elections. Russia has denied it is meddling.

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Stephen McGrath reported from Bucharest, Romania. Associated Press writer Nicolae Dumitrache in Comrat, Moldova, contributed to this report.