LONDON: OPEC+ is set to agree on Sunday a fourth increase in oil ‌output targets ⁠in as ⁠many months, three OPEC+ sources said, even though the U.S. war with Iran is ​still preventing several of the group's members from pumping more.The war has cut oil flows via the Strait of Hormuz, creating the world's biggest ever supply crisis as key OPEC+ members including Saudi Arabia have been unable to supply customers in full since the end of ⁠February. The ‌crisis for OPEC+ deepened when the United Arab Emirates left the Organization of the Petroleum Exporting Countries after almost 60 years.Seven ⁠core members of OPEC+, which groups OPEC and allied producers including Russia, have increased their output quotas from April to June by almost 600,000 barrels per day.Also read | The safe keepers: Inside India's booming locker economyIn reality, the group's production has collapsed due to export cuts by Gulf members, averaging 33.19 million bpd in April versus 42.77 million in February, according to OPEC figures.On Sunday, the seven members will likely increase targets by about 188,000 ‌bpd from July, the sources said. This is the same as the June hike, which was adjusted down from monthly ​increases of 206,000 ​bpd in May ⁠and April to take into account the UAE exit.All the sources spoke on condition of anonymity and said a final decision had not been made.Also read | Major change in buyer behaviour as e-scooters race deeper into BharatThe seven ​of 21 OPEC+ members due to meet on Sunday are Saudi Arabia, Iraq, Kuwait, Algeria, Kazakhstan, Russia, and Oman.A full OPEC+ ministerial meeting is also scheduled for Sunday but is not expected to make any policy changes, the sources said.