Medical staff in protective gear transport an elderly patient suspected of having COVID-19 in a wheelchair at a tent hospital erected to care for coronavirus patients in Kakhovka, Ukraine, on Sunday, Nov. 7, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

Medical staff treat a coronavirus patient at a tent hospital erected for COVID-19 patients in Kakhovka, Ukraine, on Sunday, Nov. 7, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

Medical staff transport a coronavirus patient to an ICU of a hospital in Kakhovka, Ukraine, on Sunday, Nov. 7, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

Medical workers walk outside the hospital in Kakhovka, Ukraine, on Sunday, Nov. 7, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

A medical staff member stands near Oleksandr Kymanov, a coronavirus patient in an ambulance in Rozdolne, Ukraine, waiting to drive him to a tent hospital erected to care for those with COVID-19 in Kakhovka, Ukraine, on Sunday, Nov. 7, 2021. Kymanov cited various falsehoods about the vaccine for refusing to get vaccinated. (AP Photo/Evgeniy Maloletka)

Medical staff treat a coronavirus patient in tents, erected adjacent to a hospital in the city of Kakhovka, Ukraine, on Sunday, Oct. 31, 2021. Ukraine has one of Europe's lowest vaccination rates and a struggling and underfunded health care system. It is setting records almost daily for COVID-19 infections and deaths. (AP Photo/Evgeniy Maloletka)

Elderly patients wait for treatment at a tent hospital erected to care for COVID-19 sufferers in Kakhovka, Ukraine, on Sunday, Oct. 31, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

A syringe sits in a vial at a tent hospital erected for COVID-19 patients in Kakhovka, Ukraine, on Sunday, Oct. 31, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

A coronavirus patient breathes with an oxygen mask at a tent hospital for COVID-19 patients in Kakhovka, Ukraine, on Sunday, Oct. 31, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

A coronavirus patient breathes with an oxygen mask at a tent hospital for COVID-19 patients in Kakhovka, Ukraine, Sunday, Oct. 31, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka), APTOPIX

Medical staff attend a briefing at a tent hospital erected for COVID-19 patients in Kakhovka, Ukraine, on Sunday, Oct. 31, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

A medical worker treats a coronavirus patient at a tent hospital in Kakhovka, Ukraine, on Sunday, Oct. 31, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

A medical worker helps a patient with coronavirus arriving at a tent hospital in Kakhovka, Ukraine, on Sunday, Oct. 31, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

Dr. Oleksandr Molchanov, second right, and another medical worker perform CPR on a patient at a hospital in Kakhovka, Ukraine, on Friday, Oct. 29, 2021. Health care workers like Molchanov are being stretched to the limit because of a surge in coronavirus infections and deaths. He works a 42-hour shift, tending to patients in a hospital and in adjacent tents before taking two days off. (AP Photo/Evgeniy Maloletka), APTOPIX

Dr. Oleksandr Molchanov speaks to The Associated Press after performing CPR on a patient in a hospital in Kakhovka, Ukraine, on Friday, Oct. 29, 2021. He works a 42-hour shift, tending to patients in a hospital and in adjacent tents due to a surge in COVID-19 infections and deaths. (AP Photo/Evgeniy Maloletka)

Dr. Oleksandr Molchanov, second right, and another medical worker perform CPR on a patient at a hospital in Kakhovka, Ukraine, on Friday, Oct. 29, 2021. Health care workers like Molchanov are being stretched to the limit because of a surge in coronavirus infections and deaths. He works a 42-hour shift, tending to patients in a hospital and in adjacent tents before taking two days off. (AP Photo/Evgeniy Maloletka)

Dr. Oleksandr Molchanov stands in a corridor taking a short rest after performing CPR on a patient at a hospital in Kakhovka, Ukraine, on Friday, Oct. 29, 2021. Health care workers like Molchanov are being stretched to the limit because of a surge in coronavirus infections and deaths in Ukraine. He works a 42-hour shift, tending to patients in a hospital and in adjacent tents before taking two days off. (AP Photo/Evgeniy Maloletka)

A medical worker prepares to transport the body of a COVID-19 victim at a hospital in Kakhovka, Ukraine, on Friday, Oct. 29, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka), APTOPIX

Medical workers dress the body of a COVID-19 victim in the morgue of a hospital in Kakhovka, Ukraine, on Friday, Oct. 29, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

A tent hospital erected to care for COVID-19 patients stands in Kakhovka, Ukraine, Friday, Oct. 29, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. (AP Photo/Evgeniy Maloletka)

Dr. Oleksandr Molchanov poses in a hall at a hospital in Kakhovka, Ukraine, on Friday, Oct. 29, 2021. Ukraine, with one of Europe's lowest vaccination rates and a struggling and underfunded health care system, is setting records almost daily for coronavirus infections and deaths. "We are extinguishing the fire again, we are working as at the front, but our strength and capabilities are limited," Molchanov said. "We are working to the limit." (AP Photo/Evgeniy Maloletka)