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On Sept. 29, 2021, Russian President Vladimir Putin, right, and Turkish President Recep Tayyip Erdogan talk to each other during their meeting in the Bocharov Ruchei residence in the Black Sea resort of Sochi, Russia. In Russia, it's common to get an antibody test for the coronavirus and share the results. Putin referred to his own test results while talking to Erdogan, bragging about how he avoided infection even though dozens of people around him caught the virus, including someone who spent a whole day with him. (Vladimir Smirnov/Sputnik, Kremlin/Pool Photo via AP)