The FT has written an article that supposedly focuses on the US sources of growing diplomatic antipathy between the US and Saudi Arabia. The source of disagreement: the treatment of Iran.

As US President Barack Obama arrives on a valedictory visit to Saudi Arabia this week, that 70-year-old bargain looks frayed by fractious relations with a ruling House of Saud that is coming under unpredictable new management. The shale-based energy revolution meanwhile shows the potential to liberate the US from dependence on Saudi and Gulf oil. Mr Obama's main foreign policy achievement, the nuclear deal struck last year between international powers and Iran, is abhorrent to Saudi Arabia, whose virulently sectarian Wahhabi interpretation of Sunni Islam abominates the Shia Islam of Iran and its Arab network of co-religionists from Baghdad to Beirut.

But it was not just Iran.