The United Arab Emirates said on Tuesday it was quitting Opec, dealing a heavy blow to the oil producers’ group as an unprecedented energy crisis triggered by the Iran war exposes discord among Gulf nations.

The stunning loss of the UAE, a longstanding Opec member, could create disarray and weaken the group, which has usually sought to show a united front despite internal disagreements over a range of issues from geopolitics to production quotas.

UAE Energy Minister Suhail Mohamed al-Mazrouei told Reuters the decision was taken after a careful look at the regional power’s energy strategies.

Asked whether the UAE consulted with Saudi Arabia, he said the UAE did not raise the issue with any other country.

“This is a policy decision, it has been done after a careful look at current and future policies related to level of production,” said the energy minister.

Mazrouei said the UAE’s move, in which it will leave Opec and Opec+ as of May 1, would not have a huge impact on the market because of the constraints in the strait.

Opec Gulf producers have already been struggling to ship exports through the Strait of Hormuz, a narrow chokepoint between Iran and Oman through which a fifth of the world’s crude oil and liquefied natural gas normally passes, because of Iranian threats and attacks against vessels.

Mazrouei said the move would not have a huge impact on the market because of the situation in the strait.

But the UAE exit from OPEC represents a big win for US President Donald Trump, who has accused the organisation of “ripping off the rest of the world” by inflating oil prices.

Trump has also linked US military support for the Gulf with oil prices, saying that while the US defends Opec members, they “exploit this by imposing high oil prices”.

The move came after the UAE, a regional business hub and one of Washington’s most important allies, criticised fellow Arab states for not doing enough to protect it from numerous Iranian attacks during the war.

Anwar Gargash, the diplomatic adviser for the UAE president, criticised the Arab and Gulf response to the Iranian attacks in a session at the Gulf Influencers Forum on Monday.

“The Gulf Cooperation Council countries supported each other logistically, but politically and militarily, I think their position has been the weakest historically,” Gargash said.

“I expect this weak stance from the Arab League and I am not surprised by it, but I haven’t expected it from the (Gulf) Cooperation Council and I am surprised by it,” he said.