Fears that attack could lead to conflict across region prompted lobbying by longstanding US allies

Saudi Arabia, Qatar, Turkey and Oman urged Donald Trump not to launch airstrikes against Iran in a last-minute lobbying campaign prompted by fears that an attack by Washington would lead to a major and intractable conflict across the Middle East.

The warnings of chaos from the longstanding US allies appear to have helped persuade Trump late on Wednesday to hold off for the moment on a military assault. In the case of Saudi Arabia, its reticence led it to deny the US use of its airspace to mount any attacks.

Continuing discussions, the Saudi Arabian foreign minister, Prince Faisal bin Farhan, conferred by phone with his counterparts from Iran, Oman and Turkey on Thursday.

Iran remains politically apart from the Gulf states, partly owing to its continued support for its weakened network of regional proxies, known as the axis of resistance, and its refusal to back a two state-solution for Palestine as well as disputes over three islands in the Gulf claimed by the United Arab Emirates, a claim backed by the Gulf Cooperation Council.