Relatives and friends of slain hostages attend a ceremony marking the 15th anniversary of the 2002 Chechen gunmen attack on a Moscow Theatre, in Moscow, Russia, Thursday, Oct. 26, 2017. The October 2002 siege was widely seen as one of the darkest moments of Putin's presidency. Many Russians blamed Putin for the heavy death toll among the hostages when Russian special forces stormed the Dubrovka Theater. (AP Photo/Ivan Sekretarev)