Two diplomats said the meeting of the Council’s 15 members and the vote were set for Saturday morning, rather than Friday as earlier planned. Friday is a UN ​holiday.

Oil prices have surged since the United States and Israel struck Iran at the end of February, unleashing a conflict ​that has run for more than a month and effectively closed the key shipping artery.

Diplomats said Bahrain, the current chair of the Security Council, finalised a draft resolution, seen by Reuters, that would authorise “all defensive means necessary” to protect commercial shipping.

Earlier on Thursday, Bahrain’s Foreign Minister Abdullatif bin Rashid Al Zayani told the council that a vote would be held on ​Friday, “God willing”, adding that Bahrain looked forward to a “unified position from this esteemed council.”

Bahrain, backed in its efforts to secure a resolution by other Gulf Arab states and Washington, had previously dropped an explicit reference to binding enforcement to overcome objections from other nations, particularly Russia and China.

The draft ​seen by Reuters authorises the measures “for a period of at least six months … and until the council decides ​otherwise.”

However, in remarks to the Security Council on Thursday morning, China’s U.N. envoy Fu Cong opposed authorizing force.

Such a move would be “legitimising the unlawful and ‌indiscriminate ⁠use of force, which would inevitably lead to further escalation of the situation and lead to serious consequences,” he added.

A fourth draft of the resolution was put under a so-called silence procedure for approval until Thursday noon, but a Western diplomatic source said the silence had been broken by China, France and Russia.

Diplomats said a text had subsequently been finalised, or “put in blue,” which means a ​vote can take place.

A Security Council ​resolution requires at least nine ⁠votes in favour and no vetoes from the five permanent members, Britain, China, France, Russia and the United States.

Al Zayani said Iran’s “unlawful and unjustified attempt” to control international navigation in the Strait of ​Hormuz threatened global interests and required a “decisive response.”

The secretary-general of the 22-member League of Arab States, ​Ahmed Aboul Gheit, ⁠told the Security Council it backed Bahrain’s efforts to secure a resolution.

On Thursday, Britain hosted a meeting with more than 40 countries on efforts to reopen and ensure safe passage through the Strait of Hormuz and also expressed support for Bahrain’s move to secure a resolution on the ⁠issue.

On Wednesday, ​US President Donald Trump vowed to continue attacks, but did not lay out a ​plan to reopen the strait.

That drove oil prices even higher, by fuelling concern that the United States might not take a major role in ensuring safe passage for ​shippers through the waterway.