Donald Trump has just blown up his goal of isolating Iran

A blood red flag was raised over the Jamkaran mosque in the Iranian holy city of Qom last week, one normally reserved to commemorate the death of martyrs. This time, it was intended as a call to arms. ‘We have unfurled this flag so that all [Shia] believers in the world gather around it to avenge Qassem Soleimani’s blood unjustly shed,’ said the mosque’s leader. In Tehran, there were calls for bloody retribution for the air strike that killed Iranian general Soleimani — and everywhere, talk of all-out war. If it was also intended to strike the fear of Allah into the hearts of Iran’s Sunni Arab enemies, it certainly succeeded.

In Riyadh, there was panic. The Saudi crown prince, Mohammed bin Salman, hastily sent an anti-war delegation to Washington and London. At home, his officials emphasised that the kingdom had not been consulted beforehand about the drone strike. ‘Please don’t blame us,’ was the message to Tehran.