MOSCOW — Russia’s daily number of new coronavirus infections topped 20,000 Friday, setting a new record since the beginning of the pandemic. Russia’s tally of confirmed coronavirus cases — currently the fourth largest in the world – has exceeded 1.7 million following a quick spread of contagion since September. The government’s coronavirus task force has reported 29,887 deaths since March. Of 20,582 new cases reported Friday, Moscow accounted for 6,253 infections, the capital’s highest number since May. Despite new daily records, authorities insist there is no need to impose a second lockdown or shut down businesses nationwide. They argue that the health care system is capable of handling a surge in infections. Russian media, however, have reported on overwhelmed hospitals, drug shortages and inundated medical workers in some regions, indicating that the health care system is under significant strain.