FILE - In this Aug. 6, 2020, file photo provided by Russian Direct Investment Fund, an employee works with a coronavirus vaccine at the Nikolai Gamaleya National Center of Epidemiology and Microbiology in Moscow, Russia. Russians are flocking to Serbia to receive Western-approved COVID-19 shots. Although Russia has its own vaccine known as Sputnik V, the shot has not been approved by international health authorities. (Alexander Zemlianichenko Jr/Russian Direct Investment Fund via AP, File)
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