ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan (R) and his Russian counterpart Vladimir Putin (L) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( İsa Terli - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan (3rd R) and his Russian counterpart Vladimir Putin (4th L) open the valve during the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. Serbian President Aleksandar Vucic (2nd R), Bulgarian Prime Minister Boyko Borisov (3rd L) and Turkish Parliament Speaker Mustafa Sentop (L) also attended the ceremony. ( Serhat Çağdaş - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan (R) and his Russian counterpart Vladimir Putin (L) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( İsa Terli - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan (R) and his Russian counterpart Vladimir Putin (L) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( İsa Terli - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan (R) and his Russian counterpart Vladimir Putin (L) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( İsa Terli - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan (R) and his Russian counterpart Vladimir Putin (L) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( Serhat Çağdaş - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: Russian president Vladimir Putin and President of Turkey Recep Tayyip Erdogan (not seen) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( Onur Çoban - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan (R) and his Russian counterpart Vladimir Putin (L) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( Mustafa Kamacı - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: President of Turkey Recep Tayyip Erdogan and his Russian counterpart Vladimir Putin (not seen) attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( Mustafa Kamacı - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: (----EDITORIAL USE ONLY – MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) President of Turkey Recep Tayyip Erdogan and Russian President Vladimir Putin attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT - Anadolu Agency )
ISTANBUL, TURKEY - JANUARY 8: (----EDITORIAL USE ONLY – MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) President of Turkey Recep Tayyip Erdogan and Russian President Vladimir Putin attend the opening ceremony of TurkStream natural gas pipeline project, at Halic Congress Center in Istanbul, Turkey on January 08, 2020. ( TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT - Anadolu Agency )