
ANKARA, TURKEY - SEPTEMBER 28: President of Russia, Vladimir Putin (R) meets with Turkish President Recep Tayyip Erdogan (L) at Presidential Complex during his official visit in Ankara, Turkey on September 28, 2017. ( Kayhan Özer - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: President of Russia, Valdimir Putin (C) leaves the plane as it arrives at Esenboga International Airport in Ankara, Turkey on September 28, 2017 prior to his official visit. ( Murat Kaynak - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: President of Russia, Valdimir Putin (3rd L) leaves the plane as it arrives at Esenboga International Airport in Ankara, Turkey on September 28, 2017 prior to his official visit. ( Murat Kaynak - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: Turkish President Recep Tayyip Erdogan (R) and President of Russia, Vladimir Putin (L) hold a joint press conference following their meeting, at Presidential Complex in Ankara, Turkey on September 28, 2017. ( Kayhan Özer - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: Turkish President Recep Tayyip Erdogan (R) and President of Russia, Vladimir Putin (L) shake their hands after a joint press conference following their meeting, at Presidential Complex in Ankara, Turkey on September 28, 2017. ( Halil Sağırkaya - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: Turkish President Recep Tayyip Erdogan (R) and President of Russia, Vladimir Putin (L) hold a joint press conference following their meeting, at Presidential Complex in Ankara, Turkey on September 28, 2017. ( Halil Sağırkaya - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: President of Russia, Vladimir Putin speaks during a joint press conference with Turkish President Recep Tayyip Erdogan (not seen) following their meeting, at Presidential Complex in Ankara, Turkey on September 28, 2017. ( Halil Sağırkaya - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: Turkish President Recep Tayyip Erdogan speaks during a joint press conference with President of Russia, Vladimir Putin (not seen) following their meeting, at Presidential Complex in Ankara, Turkey on September 28, 2017. ( Halil Sağırkaya - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: President of Russia, Vladimir Putin (L) meets with Turkish President Recep Tayyip Erdogan (R) at Presidential Complex during his official visit in Ankara, Turkey on September 28, 2017. ( Kayhan Özer - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: President of Russia, Vladimir Putin (L) meets with Turkish President Recep Tayyip Erdogan (R) at Presidential Complex during his official visit in Ankara, Turkey on September 28, 2017. ( Kayhan Özer - Anadolu Agency )

ANKARA, TURKEY - SEPTEMBER 28: President of Russia, Vladimir Putin (C-L) is welcomed by Turkish President Recep Tayyip Erdogan (C-R) with an official ceremony, at Presidential Complex in Ankara, Turkey on September 28, 2017. ( Kayhan Özer - Anadolu Agency )