People in Russia have defied police warnings and freezing temperatures to hold some of the biggest protests yet against President Vladimir Putin. Thousands rallied in nearly 70 cities to demand the release of opposition leader Alexei Navalny, who was arrested as he returned from Germany. More than 3,000 demonstrators were arrested. Will the protests pose a real challenge to Putin's rule? Presenter: Mohammed Jamjoom Guests: Sergey Markov - Director, Institute for Political Studies. Domitilla Sagromoso - Lecturer in Security and Development, King’s College London. Maria Lipman - Senior Associate, Institute for European, Russian and Eurasian Studies, George Washington University. - Subscribe to our channel: aje.io/AJSubscribe - Follow us on Twitter: twitter.com/AJEnglish - Find us on Facebook: www.facebook.com/aljazeera - Check our website: www.aljazeera.com/ #AlJazeeraEnglish #Russia #Putin