Russia’s Prime Minister Mikhail Mishustin returned to his duties on Tuesday after recovering from the coronavirus, as total infections approached 300,000 and officials said new cases were dropping off. President Vladimir Putin signed a decree reinstating Mishustin as the head of government, nearly three weeks after the prime minister announced on television he had tested positive for coronavirus. Mishustin was just one of several high-ranking Russian officials to have been infected, including the ministers of culture, education and construction, as well as Putin’s spokesman Dmitry Peskov.