Ian Black is a visiting senior fellow at the Middle East Centre at the London School of Economics.

He said some local media in Saudi Arabia and the United Arab Emirates are accusing Rex Tillerson of taking Qatar's side in the dispute with its Arab neighours.

Black said the agreement signed by the United States and Qatar to combat "terror" financing is "helpful" in mending the Gulf dispute, but is still seen as an insufficient step by the blockading countries to bring an "immediate end to the confrontation".