The country’s charm offensive and global mediator role – as well as a $400m plane – reveal a complicated relationshipOn his tour of the Middle East last week, Donald Trump was treated like royalty by the leaders of the wealthiest countries in the Arab world. The US president was feted in gilded ballrooms, his motorcade was flanked by dozens of men riding white Arabian horses and he was awarded an elaborate gold medal necklace. The leaders of Saudi Arabia, Qatar and the United Arab Emirates went out of their way to show Trump that they respect him more than his predecessor, Joe Biden.While Trump frequently praised Saudi and UAE leaders during his first term, he was highly critical of Qatar, a small emirate that is rich in natural gas but usually overshadowed by its two larger and more powerful neighbors. In June 2017, Trump said Qatar “has historically been a funder of terrorism at a very high level” and he supported a blockade against the country, led by Saudi Arabia and the UAE. Qa...