TBILISI, Georgia (AP) -- Georgians headed to the polls Saturday in a ballot many citizens see as a make-or-break vote on the opportunity to join the European Union.

The pre-election campaign in the South Caucasus nation of 3.7 million people has been dominated by foreign policy and marked by a bitter fight for votes and allegations of a smear campaign. Some Georgians complained of intimidation and being pressured to vote for the ruling party, Georgian Dream, while the opposition accused the party of carrying out a "hybrid war" against its citizens.

Ahead of the parliamentary election, Bidzina Ivanishvili -- a shadowy billionaire who set up Georgian Dream and made his fortune in Russia -- vowed again to ban opposition parties should his party win.

Georgian Dream will hold opposition parties "fully accountable under the full force of the law" for "war crimes" committed against the people of Georgia, Ivanishvili said at a pro-government rally in the capital Tbilisi Wednesday. He did not explain what crimes he believes the opposition has committed.

Georgians will elect 150 lawmakers from 18 parties. If no party wins the 76 seats required to form a government for a four-year term, the president will invite the largest party to form a coalition.

Many believe the election may be the most crucial vote of their lifetimes; it will determine whether Georgia gets back on track to EU membership or embraces authoritarianism and falls into Russia's orbit.

"It's an existential election," Georgian President Salome Zourabichvili said.

Georgians want "European integration, want to move forward and want policies which will bring us a better, more stable, future," Qristine Tordia, 29, told The Associated Press shortly after voting in the capital, Tbilisi.

Around 80% of Georgians favor joining the EU according to polls and the country's constitution obliges its leaders to pursue membership in that bloc and NATO.

But Brussels put Georgia's bid for entry to the EU on hold indefinitely after the ruling party passed a "Russian law" cracking down on freedom of speech in June. Many Georgians fear the party is dragging the country towards authoritarianism and killing off hopes it could join the EU.

The opposition parties have ignored Zourabichvili's request to unite into a single party but have signed up to her "charter" to carry out the reforms required by the EU to join.

Zourabichvili told the AP on Thursday she believed most Georgians would mobilize to vote "despite some instances of intimidation, despite the use of state resources ... and the use of financial resources" by the government.

Georgian Dream took out billboards across the country contrasting black-and-white images of destruction in Ukraine with colorful images of life in Georgia alongside the slogan, "Say no to war -- choose peace."

The governing and opposition parties told voters they would pursue EU membership even though laws passed by Georgian Dream have put that hope on hold.

"The EU decided to stop Georgia's integration process unilaterally," said Vakhtang Asanidze, who spoke to AP at a pro-government rally in Tbilisi. He said he saw no reason why Georgia could not join the EU in spite of the laws.

At the EU summit last week, EU leaders said they have "serious concerns regarding the course of action taken by the Georgian government."

While Georgian Dream has adopted laws similar to those used by the Kremlin to crack down on its critics, voters at the pro-government rally said they did not view the election as a choice between Russia or Europe.

"We remember everything about Russia, including Abkhazia and South Ossetia," said Latavra Dashniani at the rally, referring to Russia's occupation of 20% of Georgian territory after the two countries fought a short war in 2008.

Voting for the ruling party, she said, would ensure Georgia enters Europe "with dignity," alluding to its conservative values, including opposition to rights for LGBTQ+ people.

Polls opened in the parliamentary election at 8 a.m. local time and will close 12 hours later.

Georgian Dream stands against three coalitions: the Unity National Movement, the Coalition for Changes Lelo, and Strong Georgia.

The Gakharia for Georgia party, set up by former prime minister Giorgi Gakharia, said it will not go into an alliance with anyone but will support the opposition to form a government.