Why is Dubai's Ruler tweeting in Mandarin?

Dubai's Ruler has been tweeting in Mandarin.

His Highness Sheikh Mohammed Bin Rashid Al Maktoum, Vice President and Prime Minister of the UAE and Ruler of Dubai, congratulated the leaders and people of China on their 70th National Day.

In a Tweet, that was posted in English, Arabic and Mandarin, he said the two countries share solid historical and strategic relations that contribute to achieving stability, prosperity and peace.

Burj Khalifa was also lit up in the red colour of the Chinese flag to mark the occasion.

我们向中华人民共和国政府及人民致以华诞70周年热烈祝贺。稳固的历史与战略关系将我们与中国连结在一起，并有助于实现稳定、繁荣与和平。 pic.twitter.com/mNAWL4VOTo

— HH Sheikh Mohammed (@HHShkMohd) October 1, 2019