MOSCOW, June 30 — Russia reported 669 coronavirus-related deaths nationwide today, the most confirmed in a single day since the pandemic began, amid a surge in cases that authorities blame on the Delta variant.

The government coronavirus taskforce also confirmed 21,042 new Covid-19 cases in the last 24 hours, including 5,823 in Moscow. That pushed the national case total to 5,514,599 since the start of the outbreak. — Reuters