BEIRUT—Syrian President Bashar Assad and his wife have recovered from COVID-19 and returned to their regular duties on Tuesday, three weeks after they had tested positive for the coronavirus, the president’s office said. According to the statement, Syria’s first couple had their PCR tests and the results were negative, and the mild symptoms of the virus that they had experienced before were now gone. Assad, 55, and his wife, Asma, who is 10 years younger and had announced her recovery from breast cancer in 2019, had isolated themselves since testing positive on March 8. Later Tuesday, Assad’s office said the president headed a Cabinet meeting, his first public appearance in weeks. Syria is witnessing a sharp increase in cases. Earlier this month, state media has reported that intensive care units in state hospitals in the capital of Damascus were full and that medical staff has been called to stay on …