Taksim Square is seen during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in central Istanbul, Turkey December 5, 2020. Picture taken with a drone. REUTERS/Murad Sezer

Taksim Square is seen during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in central Istanbul, Turkey December 5, 2020. Picture taken with a drone. REUTERS/Murad Sezer

A foreign tourist pauses in front of a closed shop at the main shopping and pedestrian street of Istiklal?during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

A social distancing sign is seen at the entrance of the main shopping and pedestrian street of Istiklal?during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

Pigeons fly over the Taksim Square during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

A man rides a bicycle at the deserted main shopping and pedestrian street of Istiklal?during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

Police officers check documents of foreign tourists at the entrance of the main shopping and pedestrian street of Istiklal?during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

Police officers check documents of foreign tourists at the entrance of the main shopping and pedestrian street of Istiklal?during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

The deserted main shopping and pedestrian street of Istiklal?is pictured during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

Police cars are parked at the entrance of the main shopping and pedestrian street of Istiklal?during a nation-wide weekend curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey December 5, 2020. REUTERS/Murad Sezer

Drone footage reveals a highway during a two-day curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey, December 5, 2020. REUTERS/Mehmet Emin Caliskan

Drone footage reveals Taksim Square during a two-day curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey, December 5, 2020. REUTERS/Mehmet Emin Caliskan

Drone footage reveals historical Galata Tower during a two-day curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey, December 5, 2020. REUTERS/Mehmet Emin Caliskan

Drone footage reveals Maiden's Tower, an islet on the Bosphorus which dates back to 341 B.C. during a two-day curfew which was imposed to prevent the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey, December 5, 2020. REUTERS/Mehmet Emin Caliskan

A specialist works during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A specialist works during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A specialist works during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows boxes containing vials with Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a production facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows boxes containing vials with Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a production facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows boxes during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

Specialists work during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A specialist works during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows boxes during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

Specialists work during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A specialist holds vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A specialist demonstrates a vial containing Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a production facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A specialist works during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows boxes containing vials with Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a production facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A view shows vials during the production of Gam-COVID-Vac, also known as Sputnik-V, vaccine against the coronavirus disease (COVID-19) at a facility of BIOCAD biotechnology company in Saint Petersburg, Russia December 4, 2020. Picture taken December 4, 2020. REUTERS/Anton Vaganov

A vial with Sputnik V (Gam-COVID-Vac) vaccine is pictured during the vaccination against the coronavirus disease (COVID-19) at a clinic in Moscow, Russia December 5, 2020. REUTERS/Maxim Shemetov

A medical worker demonstrates a vial with Sputnik V (Gam-COVID-Vac) vaccine during the vaccination against the coronavirus disease (COVID-19) at a clinic in Moscow, Russia December 5, 2020. REUTERS/Maxim Shemetov

Journalists film as a woman receives a jab while being injected with Sputnik V (Gam-COVID-Vac) vaccine during the vaccination against the coronavirus disease (COVID-19) at a clinic in Moscow, Russia December 5, 2020. REUTERS/Maxim Shemetov

A medical worker fills a syringe with Sputnik V (Gam-COVID-Vac) vaccine before administering an injection during the vaccination against the coronavirus disease (COVID-19) at a clinic in Moscow, Russia December 5, 2020. REUTERS/Maxim Shemetov

A view shows a vial with Sputnik V (Gam-COVID-Vac) vaccine during the vaccination against the coronavirus disease (COVID-19) at a clinic in Moscow, Russia December 5, 2020. REUTERS/Maxim Shemetov

A medical worker holds a vial with Sputnik V (Gam-COVID-Vac) vaccine during the vaccination against the coronavirus disease (COVID-19) at a clinic in Moscow, Russia December 5, 2020. REUTERS/Maxim Shemetov

A medical worker demonstrates a vial with Sputnik V (Gam-COVID-Vac) vaccine during the vaccination against the coronavirus disease (COVID-19) at a clinic in Moscow, Russia December 5, 2020. REUTERS/Maxim Shemetov

Woman holds a vial labelled "COVID-19 Coronavirus Vaccine" over dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration

Woman holds a vial labelled "COVID-19 Coronavirus Vaccine" over dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration

Woman holds vials labelled "COVID-19 Coronavirus Vaccine" over dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration

Woman holds a vial labelled "COVID-19 Coronavirus Vaccine" over dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration

Woman holds vials labelled "COVID-19 Coronavirus Vaccine" over dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 4, 2020. Picture taken December 4, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 4, 2020. Picture taken December 4, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 4, 2020. Picture taken December 4, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 4, 2020. Picture taken December 4, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 4, 2020. Picture taken December 4, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 4, 2020. Picture taken December 4, 2020. REUTERS/Dado Ruvic/Illustration

Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 4, 2020. Picture taken December 4, 2020. REUTERS/Dado Ruvic/Illustration

Montenegro's Prime Minister Zdravko Krivokapic wait for the members of his cabinet during the swearing-in ceremony for the new government at the parliament in Podgorica, Montenegro December 4, 2020. REUTERS/Stevo Vasiljevic

Montenegro's Prime Minister Zdravko Krivokapic wait for the members of his cabinet during the swearing-in ceremony for the new government at the parliament in Podgorica, Montenegro December 4, 2020. REUTERS/Stevo Vasiljevic

Montenegro's Prime Minister Zdravko Krivokapic speaks during the swearing-in ceremony for the new government at the parliament in Podgorica, Montenegro December 4, 2020. REUTERS/Stevo Vasiljevic

Montenegro's Prime Minister Zdravko Krivokapic speaks during the swearing-in ceremony for the new government at the parliament in Podgorica, Montenegro December 4, 2020. REUTERS/Stevo Vasiljevic