He was referring to a planned demonstration to protest a bill that would raise the retirement age in the country, organized by Navalny and scheduled for Sunday, coinciding with nationwide balloting that includes by-elections to the State Duma (lower house of Parliament), as well as several gubernatorial and mayoral races in cities such as Moscow.
In total 14 arrests over the decisions of administrative arrests, one person was detained in the criminal case. He says it was an attempt to thwart protests across dozens of Russian cities, including Moscow and St Petersburg.
In Moscow the authorities rejected an application from Navalny's supporters to protest in the city centre, raising the possibility that the police may disperse the rally by detaining people, as they have often done in the past.
Sputnik English reported on an "unauthorized march" in Moscow with about 2,000 protesters rallying against the pension reform.
Putin, who is 65, has attested that the pension age should be raised to 60 for women and 65 for men because there is an escalating burden on the pension system. Photos on social media indicated majority were attended by 100 or more protesters, but the crowd in St. Petersburg appeared to exceed 1,000.
Navalny, the anti-corruption activist who is Putin's most visible foe, had called for protests against the government's pension proposal before he was sentenced to 30 days in jail for organizing an unsanctioned January protest over a different issue.
Presidential frontrunner Jair Bolsonaro injured in knife attack
Video footage showed Bolsonaro atop supporters' shoulders, clutching his stomach and grimacing after the assault. Environmentalist candidate Marina Silva said the attack must be investigated and the perpetrators punished.
Meanwhile, in Moscow, incumbent mayor Sergei Sobyanin cruised to a comfortable re-election with 69.54 percent of the vote, while Vadim Kumin from the Communist Party came second with 11.65 percent. Opinion polls put Navalny's support in the single digits, but backers note he won nearly a third of the vote in a 2013 Moscow mayoral race, and believe he could give Putin a run for his money if ever allowed to run against him on a level playing field.
Officers held dozens more as protests kicked off in eastern Russian Federation and Siberia, with demonstrations set to take place in Saint Petersburg and Moscow in the afternoon.
In Moscow, authorities charged two men with assailing police.
The World Health Organization says in 2016, the life expectancy of a Russian man was 66.
The scale of the electoral setbacks for United Russia is "a unique situation", said Dmitry Orlov, a political analyst who's a member of the party's supreme council.