An Olympic gold medalist long rumoured to be Vladimir Putin’s mistress hasn’t been seen for weeks. Alina Kabaeva, 40, hasn’t made a public appearance since October 22 during a visit to her elite gymnastics school in Sochi, a Russian city on the Black Sea. Just days later a sketchy Telegram blog said the Russian president had died of a cardiac arrest, a claim the Kremlin furiously denied as ‘fake news’ at best. Only a week before, the General SVR account alleged that if the leader were to die, a body double would likely rule in his stead. Kabaeva was last...