Police officers detain an opposition supporter during a rally in Vladivostok, Russia, March 26, 2017

Police detained hundreds of protesters across Russia on Sunday, including opposition leader Alexei Navalny, after thousands took to the streets to demonstrate against corruption and demand the resignation of Prime Minister Dmitry Medvedev.

The protests, reckoned to be the biggest since a wave of anti-Kremlin demonstrations in 2011 and 2012, come a year before a presidential election which Vladimir Putin is expected to contest, running for what would be a fourth term.