What's behind China's focus on the Arab world?

Chinese President Xi Jinping has met with Saudi Crown Prince Mohammed bin Salman in Riyadh on a "pioneering trip" to "open a new era of China's relations with the Arab world' - in Xi's own words. The visit is Xi's first to the kingdom in six years. The two countries affirmed their ties and signed a series of strategic deals - including one with tech giant Huawei. The Chinese leader is expected to meet more Gulf oil producers later.