Russian President Vladimir Putin condemned weekend protests demanding the release of jailed Kremlin critic Alexei Navalny as dangerous and illegal, as the Opposition politician’s allies said they planned a similar protest for Sunday.

Police detained more than 3,700 people and used force to break up rallies across Russia on Saturday.

Putin, who avoids mentioning Navalny by name, told students on Monday that nobody should use illegal protest action to further their own interests. “Everyone has the right to express their point of view within the framework provided by the law. Anything outside the law is not just counter-productive, but dangerous,” said Putin.