Protesters take to the streets across Russia on Putin's 65th birthday

In a challenge to President Vladimir Putin on his 65th birthday, protesters rallied across Russia, heeding jailed opposition leader Alexei Navalny's call to pressure authorities into letting him enter the presidential race.

Police mostly allow demonstrations to go ahead, but not in president's hometown of St. Petersburg

A protester wearing a mask depicting Russian President Vladimir Putin attends a rally in St. Petersburg, Russia, on Saturday. The sign reads: 'A thief and a murderer.' (Dmitri Lovetsky/Associated Press)

In a challenge to President Vladimir Putin on his 65th birthday, protesters rallied across Russia on Saturday, heeding opposition leader Alexei Navalny's call to pressure authorities into letting him enter the presidential race.

Police allowed demonstrators in Moscow to rally near the Kremlin in an apparent desire to avoid marring Putin's birthday with a crackdown. A bigger rally in St. Petersburg, Putin's hometown, was disbanded by police after protesters blocked traffic and attempted to break through police cordons.

The rallies came as Navalny himself is serving a 20-day jail term for calling for an earlier unsanctioned protest.

In Moscow, several hundred protesters, most of them students, gathered on downtown Pushkinskaya Square, waving Russian flags and chanting "Russia will be free!" and "Let Navalny run!" Police warned them that the rally wasn't sanctioned and urged them to disperse, but let the protest continue for hours without trying to break it up.

Mostly teenage protesters later walked down Moscow's Tverskaya Street toward the Kremlin, shouting "Putin, go away!" and "Future without Putin!"

Supporters of Russian opposition leader Alexei Navalny attend a rally near the State Historical Museum in Moscow on Oct. 7, 2017. (Andrey Volkov/Reuters)

Police lines blocked them from approaching Red Square and they turned back. Several hours later, some made a new attempt to march on the Kremlin, shouting "Putin thief!" and briefly attempted to block traffic.

"We battle for Russia to be free from Putinism. Because the power we have now is feudal, we have no freedom of speech, no freedom of choice," said protester Stepan Fesov.

Police response muted

The authorities' decision to refrain from breaking up the Moscow protest contrasted with a more forceful response to previous Moscow rallies called by Navalny, when police detained more than 1,000 demonstrators.

Police also didn't intervene at first with a bigger unsanctioned rally in St. Petersburg, where nearly 2,000 gathered at Marsovo Pole park and then marched across the city chanting "Russia without Putin!" and "Putin, retire!"

Shortly after, police broke up the demonstration, detaining nearly 40 after some tried to break through police lines. Police said those detained were released and will face fines for blocking traffic.

One detainee, Marina Bukina, said she was injured when a police officer hit her in the head with a club.

Riot police officers block the way to protesters during a rally in St. Petersburg, Russia, on Saturday. (Dmitri Lovetsky/Associated Press)

After the St. Petersburg march was disbanded, several hundred protesters continued rallying for hours at the downtown Vosstaniya Square as police stood by without intervening.

"Putin has been in charge since I was born," said Dmitry Samokhin, an 18-year-old protester in St. Petersburg. "The country is mired in stagnation and I want to see changes."

Navalny's headquarters called for protests in 80 cities. Most were not sanctioned by authorities, but police largely refrained from dispersing the rallies that drew from a few dozen to a few hundred people. The Siberian city of Yakutsk saw a tough police response, with a few dozen demonstrators reportedly detained.

Putin's birthday marked by a day of protests in nearly 80 Russian cities organized by imprisoned opposition leader Alexei Navalny 1:53

Navalny has declared his intention to run for president in the March 2018 election, even though a criminal conviction that he calls politically motivated bars him from running. The 41-year-old anti-corruption crusader has organized waves of protests this year, raising the pressure on the Kremlin.

Putin expected to run again

Putin hasn't yet announced whether he would seek re-election, but he's widely expected to run. With his current approval ratings topping 80 per cent, he is set to easily win another six-year term in a race against torpid veterans of past election campaigns, like Communist Party chief Gennady Zyuganov.

Russian President Vladimir Putin, pictured on Friday, turned 65 on Saturday. (Mikhail Klimentyev/Sputnik, Kremlin Pool Photo/Associated Press)

Navalny argues that the high level of support for Putin comes from the lack of real political competition and urged supporters to help him get registered.

"(Putin's) 86 per cent approval rating exists in a political vacuum," he said. "It's like asking a person who has been fed rutabaga his entire life how eatable they find it and the rating will be quite high. Listen, there are other things that are better than rutabaga."

The sarcastic analogy demonstrated Navalny's stinging style, which has helped him win broad support among the young.

Navalny has worked to expand his reach with videos exposing official corruption and YouTube live broadcasts. His documentary about Prime Minister Dmitry Medvedev's alleged ill-gotten wealth has been viewed nearly 25 million times since its release in March, helping galvanize protests.

Russian opposition leader Alexei Navalny attended court in Moscow on Friday to appeal his jailing for repeatedly violating laws governing the organization of public meetings and rallies. (Maxim Shemetov/Reuters)

Following Navalny's call, tens of thousands took to the streets in dozens of cities and towns across Russia in March and June in the biggest show of defiance since the 2011-2012 anti-government protests.

Unlike those past rallies, which were driven by anti-corruption slogans, Navalny this time focused on rallying support for his own presidential bid — a reason some gave for the smaller protest in Moscow.

"Some people dislike Putin and the government, but that doesn't mean they are willing to unequivocally back Navalny," political analyst Valery Solovei said on Dozhd television.