Tens of thousands of Georgians massed outside parliament on Monday night, demanding the annulment of the weekend parliamentary election that the president denounced as rigged with the help of Russia.

The rally deepened the political crisis in the South Caucasus country, where the governing Georgian Dream party has become increasingly authoritarian and tilted toward Moscow.

“You did not lose the election,” President Salome Zourabichvili told the demonstrators who waved Georgian and European Union flags. “They stole your vote and tried to steal your future, but no one has the right to do that and you will not let anyone do that!”

Giorgi Vashadze, leader of United National Movement coalition, said the opposition won't take part in any talks with the government and push for a new vote under international supervision.

“We are not going to enter this parliament. We refuse all mandates,” he said. “We are not going to enter into any negotiations. We are going to fight until victory and we promise you, we will definitely win together.”

Natia Chachava, who was wrapped in the Georgian flag, said the demonstrators “don’t want Russia, we don’t want to back to Russia or back to the Soviet Union.”

The EU, the United States and NATO have all called for a full investigation of alleged irregularities in the Georgian election on Saturday.

Georgian Dream and the electoral commission said the vote was free and fair.

The Central Election Commission said the Georgian Dream party received 54.8 percent of the vote with almost all ballots counted.

The Kremlin on Monday denied any Russian interference in the vote, saying it was the West, not Moscow, that was trying to destabilise the situation.

“We aren’t meddling in Georgia’s internal affairs, and we have no intention of meddling,” Kremlin spokesman Dmitry Peskov said. He countered that it was the West that had tried to influence the vote.

Parliament speaker Shalva Papuashvili, a member of Georgian Dream, accused the president of creating “a coup scenario” that goes “against the constitutional order and democratic elections.”

The EU suspended Georgia’s membership application process indefinitely because of a Russian-style “foreign influence law” passed in June.

Many Georgians viewed Saturday’s vote as a pivotal referendum on the opportunity to join the EU. (Agencies)