TOPSHOT - Police officers detain protesters during a rally against governemnt plans to hike the retirement age in Saint Petersbourg, on September 9, 2018. - Plans to hike the retirement age have led to a rare outburst of public anger and seen President Vladimir Putin's approval ratings take a hit, despite some efforts to water down the changes. But discontent is unlikely to translate into upsets at the ballot box, with serious opposition candidates in the highest-profile Moscow mayoral vote barred from standing. At least 2,000 people rallied in central Moscow, an AFP correspondent said, as the capital held a mayoral election the Kremlin-backed incumbent is sure to win. (Photo by Olga MALTSEVA / AFP)