Russian opposition groups will hold more protests on Saturday against Vladimir Putin despite police arresting hundreds of demonstrators yesterday.
One of those detained was blogger Alexei Navalny. He has since been released but could face a fine for alleged public order offences.
Navalny said the next time protesters would camp out for good.
“We will protest by any means. Thousands upon thousands will take to the streets of Moscow and they will refuse to go away.We will continue until we win and get what we are trying to achieve,” he told reporters.
More than 500 people were arrested during rallies in Moscow and St Petersburg. Half of them have now been freed.
The protesters believe the election was fixed. A view shared in part by international monitors, who said the poll was riddled with large-scale fraud.
Prime Minister Putin won 64 percent of the vote, according to election authorities. He will return to his old job in early May. Putin held the position for eight years until 2008.