ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (L) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (R) leave red carnations in front of the assassinated Russian ambassador to Turkey Andrey Karlov's monument during a commemoration ceremony at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (R) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (3rd R) leave red carnations in front of the assassinated Russian ambassador to Turkey Andrey Karlov's monument during a commemoration ceremony at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov leaveS red carnations in front of the assassinated Russian ambassador to Turkey Andrey Karlov's monument during a commemoration ceremony at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (R) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (3rd R) leave red carnations in front of the assassinated Russian ambassador to Turkey Andrey Karlov's monument during a commemoration ceremony at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (C) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (3rd R) leave red carnations in front of the assassinated Russian ambassador to Turkey Andrey Karlov's monument during a commemoration ceremony at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (R) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (3rd R) leave red carnations in front of the assassinated Russian ambassador to Turkey Andrey Karlov's monument during a commemoration ceremony at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (R) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (L) attend a commemoration ceremony held for assassinated Russian ambassador to Turkey Andrey Karlov, at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (R) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (L) attend a commemoration ceremony held for assassinated Russian ambassador to Turkey Andrey Karlov, at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (R) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (C) attend a commemoration ceremony held for assassinated Russian ambassador to Turkey Andrey Karlov, at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (C) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (L) attend a commemoration ceremony held for assassinated Russian ambassador to Turkey Andrey Karlov, at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )

ANKARA, TURKEY - DECEMBER 19: Russian ambassador to Turkey Aleksey Yerhov (R) and Chairman of the Committee on Foreign Affairs of Turkish Parliament Volkan Bozkir (L) attend a commemoration ceremony held for assassinated Russian ambassador to Turkey Andrey Karlov, at Russian Embassy in Ankara, Turkey on December 19, 2018. ( Evrim Aydın - Anadolu Agency )