President Vladimir Putin's United Russia party looks set for another big win in the country's parliamentary elections, despite a drop in support.
The party claimed victory a few hours after the polls closed on Sunday evening.
There have been numerous allegations of ballot stuffing and forced voting.
But Russia's electoral commission rejected claims of widespread irregularities.
Initial results showed that with 64% of votes counted, United Russia had won nearly 48%, followed by the Communist Party with about 21%.
On Sunday night a senior United Russia official, Andrei Turchak, congratulated a crowd of supporters in Moscow on what he described as a clean and honest victory.
The partial results show that despite Mr Putin's party easily retaining its majority in parliament, it did lose some ground. In 2016, the party won 54% of the vote.
Concerns over living standards and allegations of corruption from jailed Kremlin critic Alexei Navalny have likely affected support for Mr Putin's party.
But he remains popular with many Russians who credit him with standing up to the West and restoring national pride.
Russia's marathon election has ended. But even before the first ballots were cast, it didn't look like a fair election.
Many opposition politicians and activists had been barred from the ballot. First and foremost, supporters of the jailed opposition leader Alexei Navalny.
The coronavirus pandemic was the official reason for spreading voting over three days. But critics say the extended poll lacks transparency and is open to abuse.
Reports of voting irregularities have been coming in from across Russia.
The head of the election commission, however, said the criticism was part of "a planned, deliberate campaign, well financed from abroad". It's a sign of things to come. This is how Moscow will react to any international criticism of the election: by pointing a finger at the West and claiming it's all part of a foreign conspiracy to discredit Russia.
The election saw a number of cities introduce electronic voting.
For the first time since 1993, election observers from the Organization for Security and Cooperation in Europe (OSCE) were not present due to limitations imposed by Russian authorities.
As of Sunday evening, independent vote monitoring group Golos - which the Russian authorities have branded "a foreign agent" - said it had tracked more than 4,500 reports of voting violations.
Russia's interior ministry meanwhile told reporters that it had not registered any "significant violations".
During the election, long queues were seen outside some polling stations on videos published on social media.
Interfax news agency reported that this was especially the case outside police stations. The Kremlin spokesman rejected claims that it was an indication of people being put under pressure to vote.
But Golos said it had received "numerous messages" from people who said they were being forced by their employers to vote, as well as allegations of electoral fraud.
In parts of east Ukraine controlled by Russian-backed separatists, residents with Russian citizenship were allowed to vote, with some crossing the border to visit Russian polling stations.
There has also been anger after a Smart Voting app devised by jailed Russian opposition leader Alexei Navalny was removed from Apple and Google stores on the day that Russians started voting.
Russian authorities had threatened the two companies with big fines if they refused to drop the app, which told users who could unseat ruling party candidates.
Navalny ally Leonid Volkov accused the tech giants of having "caved under the Kremlin's blackmail".
One Moscow pensioner who gave his name only as Anatoly told Reuters news agency he voted for the ruling party as he appreciated Mr Putin's efforts to restore Russia's influence on the world stage.
"Countries like the United States and Britain more or less respect us now like they respected the Soviet Union in the 1960s and 70s... The Anglo-Saxons only understand the language of force," he said.
But there was also widespread indifference.
"I don't see the point in voting," said one Moscow hairdresser who gave her name as Irina. "It's all been decided for us anyway."