A healthcare worker disinfects a street near the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

Ultra-Orthodox Jewish pilgrims wearing protective face masks walk in front of the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

Ultra-Orthodox Jewish pilgrims pray next to the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

An ultra-Orthodox Jewish pilgrim prays on the bank of a lake near the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

Ultra-Orthodox Jewish pilgrims wearing protective face masks pray on the bank of a lake near the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

Ultra-Orthodox Jewish pilgrims wearing protective face masks pray on the bank of a lake near the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

Ultra-Orthodox Jewish pilgrims walk past a banner, which reads "Wear a mask just right now!", near the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

An ultra-Orthodox Jewish pilgrim prays near the window of a building next to the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

People watch a classical concert on a floating stage on Vltava river as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

People watch a classical concert on a floating stage on Vltava river as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

People watch a classical concert on a floating stage on Vltava river as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

People watch a classical concert on a floating stage on Vltava river as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

An ultra-Orthodox Jewish pilgrim prays on the bank of a lake near the tomb of Rabbi Nachman of Breslov during the celebration of Rosh Hashanah holiday, the Jewish New Year, amid the coronavirus disease (COVID-19) outbreak in Uman, Ukraine September 19, 2020. REUTERS/Valentyn Ogirenko

A man checks a mobile phone as he sits at the Kalemegdan fortress, as the spread of the coronavirus disease (COVID-19) continues, in Belgrade, Serbia, September 19, 2020. REUTERS/Marko Djurica

People sit at the Kalemegdan fortress, as the spread of the coronavirus disease (COVID-19) continues, in Belgrade, Serbia, September 19, 2020. REUTERS/Marko Djurica

A man proposes to his girlfriend at the Kalemegdan fortress, as the spread of the coronavirus disease (COVID-19) continues, in Belgrade, Serbia, September 19, 2020. REUTERS/Marko Djurica

Ukrainian servicemen and dogs are seen at an Air Base in Vinnytsia, Ukraine September 19, 2020. REUTERS/Gleb Garanich

A U.S. serviceman is seen onboard a CV-22 tilt-rotor aircraft during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

CV-22 tilt-rotor aircrafts fly during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

CV-22 tilt-rotor aircrafts fly during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

A CV-22 tilt-rotor aircraft flies during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

A military instructor of the U.S. Army instructs Ukrainian servicemen during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

A military instructor of the U.S. Army encourages Ukrainian servicemen during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

A military instructor of the U.S. Army is seen near Ukrainian servicemen during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian servicemen are seen during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020" at the International Peacekeeping and Security Center near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

Ukrainian and U.S. servicemen train during the multinational drills "Rapid Trident 2020", at the International Peacekeeping and Security Center, near Lviv, Ukraine September 19, 2020. REUTERS/Gleb Garanich

A man wearing a face mask stands in front a giant inflatable model of planet Earth as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

A woman wearing a face mask walks past a giant inflatable model of planet Earth as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

People wearing face masks stand next to a giant inflatable model of planet Earth as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

A man wearing a face mask walks past a giant inflatable model of planet Earth as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

A woman wearing a face mask stands in front of a giant inflatable model of planet Earth as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

People wearing face masks stand next to a giant inflatable model of planet Earth as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, September 19, 2020. REUTERS/David W Cerny

A picture of U.S. President Donald Trump is seen on a smartphone in front of displayed Tik Tok and WeChat logos in this illustration taken September 18, 2020. REUTERS/Dado Ruvic/Illustration

A woman wearing a protective face mask accompanies the children amid the coronavirus disease (COVID-19) outbreak in Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

A passenger wearing a protective face mask is seen in a bus amid the coronavirus disease (COVID-19) outbreak in Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

A passenger wearing a protective face mask is seen in a bus amid the coronavirus disease (COVID-19) outbreak in Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

Ukrainian service members walk on the tarmac of an airfield during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

A CV-22 tiltrotor aircraft flies during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members are seen onboard a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

A U.S. service member jumps with a parachute during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members jump with parachutes during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members jump with parachutes during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members jump with parachutes from a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

A U.S. service member jumps with a parachute from a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

A U.S. crew member is seen onboard a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members wait before jumping with parachutes onboard a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members wait before jumping with parachutes onboard a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members wait before jumping with parachutes onboard a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

U.S. service members are seen onboard a MC-130J aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich

A hawk flies above a CV-22 tiltrotor aircraft during joint air drills conducted by Ukrainian and U.S. special operation military forces, as part of a broader cooperation aimed at enhancing interoperability between divisions, near Vinnytsia, Ukraine September 18, 2020. REUTERS/Gleb Garanich