A worker is seen next to a pipe at a construction site on the extension of Russia's TurkStream gas pipeline after a visit of Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Bulgaria's Prime Minister Boyko Borissov speaks next to Serbia's President Aleksandar Vucic during a visit to the construction site on the extension of Russia's TurkStream gas pipeline, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov arrive to inspect a construction site on the extension of Russia's TurkStream gas pipeline, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/Stoyan Nenov

Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov arrive to inspect a construction site on the extension of Russia's TurkStream gas pipeline, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Workers stand near a pipe at a construction site on the extension of Russia's TurkStream gas pipeline ahead of the visit of Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Workers stand near pipes at a construction site on the extension of Russia's TurkStream gas pipeline ahead of the visit of Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Workers stand near a pipe at a construction site on the extension of Russia's TurkStream gas pipeline ahead of the visit of Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Workers are seen through a pipe at a construction site on the extension of Russia's TurkStream gas pipeline ahead of the visit of Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Workers stand near a pipe at a construction site on the extension of Russia's TurkStream gas pipeline ahead of the visit of Serbia's President Aleksandar Vucic and Bulgaria's Prime Minister Boyko Borissov, in Letnitsa, Bulgaria, June 1, 2020. REUTERS/ Stoyan Nenov

Fireworks explode over Maiden's Tower, an islet on the Bosphorus which dates back to 341 B.C. to mark the 567th anniversary of the conquest of Istanbul by Ottoman Turks, in Istanbul, Turkey May 29, 2020. REUTERS/Umit Bektas TPX IMAGES OF THE DAY

Fireworks explode over Maiden's Tower, an islet on the Bosphorus which dates back to 341 B.C. to mark the 567th anniversary of the conquest of Istanbul by Ottoman Turks, in Istanbul, Turkey May 29, 2020. REUTERS/Umit Bektas

Fireworks explode over Maiden's Tower, an islet on the Bosphorus which dates back to 341 B.C. to mark the 567th anniversary of the conquest of Istanbul by Ottoman Turks, in Istanbul, Turkey May 29, 2020. REUTERS/Umit Bektas

Fireworks explode over Maiden's Tower, an islet on the Bosphorus which dates back to 341 B.C. to mark the 567th anniversary of the conquest of Istanbul by Ottoman Turks, in Istanbul, Turkey May 29, 2020. REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Florin Andone in action with Besiktas' Domagoj Vida REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Marcao in action with Besiktas' Burak Yilmaz REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Marcao in action with Besiktas' Burak Yilmaz REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Jean Michael Seri takes a corner as the match is played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Jean Michael Seri takes a corner as the match is played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Omer Bayram in action with Besiktas' Tyler Boyd REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Radamel Falcao in action with Besiktas' Victor Ruiz REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Younes Belhanda in action with Besiktas' Mohamed Elneny REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Mariano in action with Besiktas' Georges-Kevin Nkoudou REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray's Mariano in action with Besiktas' Victor Ruiz REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Besiktas' Victor Ruiz in action as the match is played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Galatasaray coach Fatih Terim REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Players bump fists instead of shaking hands before the match as the match will be played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Police officers in the stands before the match as the match will be played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 Police officers in the stands before the match as the match will be played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 General view before the match as the match will be played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 General view before the match as the match will be played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Soccer Football - Super Lig - Galatasaray v Besiktas - Turk Telekom Stadium, Istanbul, Turkey - March 15, 2020 General view before the match as the match will be played behind closed doors as the number of coronavirus cases grow around the world REUTERS/Umit Bektas

Workers in protective suits disinfect the Turk Telekom Stadium in Istanbul, Turkey March 14, 2020. REUTERS/Umit Bektas

Workers in protective suits disinfect the Turk Telekom Stadium in Istanbul, Turkey March 14, 2020. REUTERS/Umit Bektas

A worker in protective suit disinfects the Turk Telekom Stadium in Istanbul, Turkey March 14, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan and Russian President Vladimir Putin attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Russian President Vladimir Putin shakes hands with Bulgarian Prime Minister Boyko Borissov as they are flanked by Turkish President Tayyip Erdogan during a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan and Russian President Vladimir Putin attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan and Russian President Vladimir Putin attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan and Russian President Vladimir Putin arrive a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Russian President Vladimir Putin attends a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan, Russian President Vladimir Putin, Bulgarian Prime Minister Boyko Borissov, Serbia's President Aleksandar Vucic and officials attend ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan and Russian President Vladimir Putin attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan, Russian President Vladimir Putin, Bulgarian Prime Minister Boyko Borissov and Serbia's President Aleksandar Vucic attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan attends a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Russian President Vladimir Putin attends a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan and Russian President Vladimir Putin attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan, Russian President Vladimir Putin, Bulgarian Prime Minister Boyko Borissov and Serbia's President Aleksandar Vucic and officials attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas

Turkish President Tayyip Erdogan, Russian President Vladimir Putin, Bulgarian Prime Minister Boyko Borissov and Serbia's President Aleksandar Vucic attend a ceremony marking the formal launch of the TurkStream pipeline which will carry Russian natural gas to southern Europe through Turkey, in Istanbul, Turkey, January 8, 2020. REUTERS/Umit Bektas TPX IMAGES OF THE DAY

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge's Brandon Mechele REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge's Lois Openda REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge's Emmanuel Bonaventure REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge's Krepin Diatta REUTERS/Murad Sezer

Children play in the water as guests walk along a dock to board a cruise ship on Grand Turk, Turks and Caicos, December 17, 2019. Picture taken December, 17, 2019. REUTERS/Carlo Allegri

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge players celebrate after the match REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge coach Philippe Clement and his players celebrate after the match REUTERS/Umit Bektas

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge's Lois Openda and teammates celebrate after the match REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge's Charles de Ketelaere and teammates celebrate after the match REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge players celebrate after the match REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge players celebrate after the match REUTERS/Murad Sezer

Soccer Football - Champions League - Group A - Galatasaray v Club Brugge - Turk Telekom Stadium, Istanbul, Turkey - November 26, 2019 Club Brugge players celebrate after the match REUTERS/Murad Sezer