Turkish President Recep Tayyip Erdogan (R, Rear) and Ukrainian President Volodymyr Zelensky (L, Rear) attend a joint press conference in Istanbul, Turkey, on Oct. 16, 2020. Erdogan and Zelensky on Friday pledged to enhance cooperation in a wide range of areas amid the COVID-19 pandemic. (Xinhua)

Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky exchange documents in Istanbul, Turkey, on Oct. 16, 2020. Erdogan and Zelensky on Friday pledged to enhance cooperation in a wide range of areas amid the COVID-19 pandemic. (Xinhua)

Turkish President Recep Tayyip Erdogan (2nd R) and Ukrainian President Volodymyr Zelensky (2nd L) sign documents in Istanbul, Turkey, on Oct. 16, 2020. Erdogan and Zelensky on Friday pledged to enhance cooperation in a wide range of areas amid the COVID-19 pandemic. (Xinhua)

Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky attend a joint press conference in Istanbul, Turkey, on Oct. 16, 2020. Erdogan and Zelensky on Friday pledged to enhance cooperation in a wide range of areas amid the COVID-19 pandemic. (Xinhua)

Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky present documents in Istanbul, Turkey, on Oct. 16, 2020. Erdogan and Zelensky on Friday pledged to enhance cooperation in a wide range of areas amid the COVID-19 pandemic. (Xinhua)