Abu Dhabi's Crown Prince Sheikh Moahmmed bin Zayed al-Nahyan presents an Arabian horse as a gift to the Chinese President Xi Jinping at the Presidential Palace in Abu Dhabi, United Arab Emirates July 20, 2018. WAM/Handout via REUTERS. ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY.

Prime Minister and Vice President of the United Arab Emirates and Ruler of Dubai Sheikh Mohammed bin Rashed al-Maktoum, Chinese President Xi Jinping and Abu Dhabi's Crown Prince Sheikh Mohammed bin Zayed al-Nahyan meet at the Presidential Palace in Abu Dhabi, United Arab Emirates July 20, 2018. WAM/Handout via REUTERS. ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. Image used for illustrative purpose.

Chinese President Xi Jinping signs a book during the presence of the Prime Minister and Vice President of the United Arab Emirates and Ruler of Dubai Sheikh Mohammed bin Rashed al-Maktoum and Abu Dhabi's Crown Prince Sheikh Mohammed bin Zayed al-Nahyan at the Presidential Palace in Abu Dhabi, United Arab Emirates July 20, 2018. WAM/Handout via REUTERS.

Prime Minister and Vice President of the United Arab Emirates and Ruler of Dubai Sheikh Mohammed bin Rashed al-Maktoum meets with Chinese President Xi Jinping at the Presidential Palace in Abu Dhabi, United Arab Emirates July 20, 2018. WAM/Handout via REUTERS.

FILE IMAGE: Prime Minister and Vice President of the United Arab Emirates and Ruler of Dubai Sheikh Mohammed bin Rashed al-Maktoum, Chinese President Xi Jinping and Abu Dhabi's Crown Prince Sheikh Mohammed bin Zayed al-Nahyan pose for a photo at the Presidential Palace in Abu Dhabi, United Arab Emirates July 20, 2018. WAM/Handout via REUTERS.

Abu Dhabi's Crown Prince Sheikh Mohammed bin Zayed al-Nahyan walks with Chinese President Xi Jinping at the Presidential Palace in Abu Dhabi, United Arab Emirates July 20, 2018. Image for illustrative purposes.