MOSCOW—Moscow’s mayor on Saturday ordered a week off for some workplaces and imposed restrictions on many businesses to fight coronavirus infections that have more than doubled in the past week. The national coronavirus taskforce reported 6,701 new cases of infection in Moscow, compared with 2,936 on June 6. Nationally, the daily infection tally has spiked by nearly half over the past week, to 13,510. After several weeks of lockdown as the pandemic spread in the spring of 2020, Moscow eased restrictions and did not reimpose any during subsequent case increases. But because of the recent sharp rise, “it is impossible not to react to such a situation,” Mayor Sergei Sobyanin said. He ordered that enterprises that do not normally work on weekends remain closed for the next week while continuing to pay employees. In addition, food courts and children’s play areas in shopping centers are to close for a week …