Mohammed bin Salman (R) has asked Donald Trump (L) for more military support to counter the Houthis. The U.S.-Iran war has reached crisis point for Saudi Arabia and its de facto leader, Crown Prince Mohammed bin Salman. The kingdom was spared the worst of the Islamic Republic's counterstrikes against the U.S. and Israel early in the conflict, and was even benefiting from higher crude prices as it used a land pipeline to bypass the Strait of Hormuz. That all changed when the Houthis started firing at Saudi Arabia on a near-daily basis this month. The Iran-backed militants have also captured more territory in Yemen, where they are based, tightening their control over Bab el-Mandeb, another vital strait for shipping and energy markets.

How Saudi Arabia's spending spree reached the end of the line Autocratic monarchs once left an echo of their glory in the ruins of the megaprojects they commanded at the peak of their unchallenged power. Those monumental physical traces are to be found in the fertile plains, mountainsides and deserts of the Middle East. But one of their most prominent modern counterparts may only have a digital footprint to leave behind for some of his most ambitious concepts. A decade ago, the Crown Prince of Saudi Arabia Mohammed bin Salman - or MBS as he is widely known - decreed a revisioning of his country that leapt from the realm of science fiction. It was called Vision 2030. Extraordinary monolithic structures were to help bring forth new technological marvels not just for the Kingdom but for the world.

Masayoshi Son, with a net worth of $21.5bn, is reputed to be Japan's wealthiest person. He is also one of the world's slickest and smartest salesmen. In September 2016, Son met then Saudi Deputy Crown Prince Mohammed bin Salman. By the end of the 45-minute meeting, bin Salman, MBS, as he is known, had committed $45bn from Saudi Arabia's Public Investment Fund (PIF) to Son's Vision Fund. That's nearly half the value of what has become the biggest investment fund the world has ever seen.