A visitor wearing a face mask walks past ambulances on display at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)

A medical worker does a COVID-19 test at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)

A staff member wearing a face mask examines a woman at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)

A medical worker performs COVID-19 test at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)

Protective suit is on display at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)

Medical staff demonstrate their work at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)

Visitors wearing face masks walk past medical workers wearing protective suit at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)

A medical worker dressed in safety suit stands inside a clinic at a health forum in Moscow, Russia, Aug. 11, 2020. The nationwide forum "The Nation's Health as the Foundation for a Flourishing Russia" is held in Moscow on Aug. 11-13. (Photo by Alexander Zemlianichenko Jr/Xinhua)