Tens of thousands of Alexei Navalny supporters have protested across Russia in one of the largest demonstrations against Vladimir Putin’s rule in the past decade. More than 1,870 people were arrested by riot police on Saturday at dozens of unsanctioned rallies throughout the country, spanning from Kaliningrad in the west to Vladivostok in the far east, as the turnout of those calling for the opposition leader’s release from jail far surpassed many protesters’ expectations.