PRAGUE -- A parliamentary election in the Czech Republic on Friday and Saturday could deprive Ukraine of a staunch supporter and put the Czechs on a course away from the European mainstream, following the pro-Russian path taken by Hungary and Slovakia.

Billionaire Andrej Babiš is predicted to be the latest populist leader in Central Europe to stage an electoral comeback, as opinion polls put him on course for victory over a pro-Western coalition that defeated him four years ago. If he wins, he would join the ranks of Viktor Orbán of Hungary and Robert Fico of Slovakia, whose countries have refused to provide military aid to Ukraine, continue to import Russian oil and oppose sanctions on Russia.

Amid Russia's full-scale invasion of Ukraine, Prime Minister Petr Fiala and his coalition of three conservative parties called Together have made the threat from Moscow the key to their campaign. "Vote for freedom! Vote for security!" they urged the electorate.

The opposition led by Babiš blamed Fiala for all the troubles of recent years, from the energy crisis to soaring inflation, and pledged to revoke his pension reform and help for Ukraine.

After the Oct. 3-4 election, "we will have, most probably, a very different setup of the government," Czech President Petr Pavel said at Harvard University in September.

Babiš joined forces with his friend Orbán to create a new alliance in the European Parliament, the "Patriots for Europe," to represent hard-right groups. Previously, he was a member of the liberal Renew group.

The Patriots are united by anti-migrant rhetoric, a critical stance toward EU policies tackling climate change, and the protection of national sovereignty.

Babiš has denied he would share the Patriots' soft spot for Russia. But he is planning to abandon a Czech initiative that has managed to acquire some 3.5 million much-needed artillery shells for Ukraine on markets outside the EU.

In his first term as prime minister, Babiš praised then-U.S. President Donald Trump with whom he has been compared ahead of his trip to the White House in 2019. In his "Strong Czechia" campaign that year, Babiš drew inspiration from Trump's "Make America Great Again" slogan.

He called Trump's reelection last year a "sensational comeback" and said he believed Trump would end the Russian war against Ukraine. But Babiš, a businessman, rejected tariffs that are Trump's solution for America's economic problems.

Babiš has been a divisive figure.

Born in Slovakia, he settled a lawsuit last year with the Slovak Interior Ministry that he did not knowingly collaborate with Communist-era secret police in what was then Czechoslovakia.

A quarter of a million people took to the streets -- the biggest such demonstrations since the 1989 anti-Communist Velvet Revolution -- twice in 2019 to demand that Babis step down as prime minister over a conflict of interest regarding EU subsidies.

He was hit by yet another scandal that linked him and hundreds of other wealthy people to offshore accounts in findings dubbed the "Pandora Papers."

Babiš lost the 2021 parliamentary election and two years later was beaten by Petr Pavel, a retired army general, in a vote for the largely ceremonial post of president.

He still faces fraud charges in a case involving EU subsidies, and the new Parliament will have to lift his official immunity for a court to issue a verdict.

Babiš is predicted to win big with some 30% of the vote, but not enough to govern alone. He will need one or two coalition partners.

They include a far-left Enough coalition of four fringe groups led by the maverick Communists and another coalition of four led by the far-right Freedom and Direct Democracy party, the major anti-migrant force that wants to expel most of 380,000 Ukrainian refugees in the country. The two coalitions don't consider Russia a threat, repeat its propaganda, and see no future for the Czech Republic in the EU and NATO.

Babiš, whose Agrofert conglomerate of some 200 companies receives EU subsidies, does not want to leave the EU or NATO. But he could form a pact with the two fringe groupings in order to bring public media under government control, and reject the EU Green Deal or migration pact.

The two coalitions received support from a network of almost 300 fake TikTok accounts, experts said. By using AI-generated video, they also spread pro-Russian propaganda, the Center for the Research of Online Risks said. It said the accounts garner 5-9 million views a week, more than the combined accounts of leaders of major political parties. Authorities are investigating.

Another potential ally, a right-wing group calling itself the Motorists, has vowed to reject the EU's environment policies.

Populist billionaire leads Czech race, may shift EU, Ukraine stance