Both countries oppose the Islamic State. But they have different goals in Syria and have been eyeing each other warily since Russia's military intervened recently.
In the latest issue of its monthly propaganda magazine, the Islamic State says it targeted the passenger plane in response to Russian airstrikes in Syria.
In comments after a meeting of the G-20, Putin implied that Russia's isolation from the West was nearing an end. He said the fight against terrorism had to be undertaken by a coalition.
Russia is facing a demographic crisis. Some women are having more babies, but there are fewer mothers overall. The country may face worse economic problems and challenges staffing its armed forces.
The move means that all athletes' samples that are currently at a Moscow lab named in a recent investigation must be moved to an accredited lab outside of Russia.
Images show Pyotr Pavlensky standing before the doors to the Lubyanka, the Soviet-era prison and former KGB headquarters that now houses the main office of the FSB security service.
An independent commission found that Russia engaged in state-sponsored doping and that the London 2012 Olympics were "sabotaged" by the widespread cheating.