LONDON, April 29 -- Opec and its allies will lose ‌some of their power over the oil market when the United Arab Emirates leaves the group on May 1, but the rest of ​the producer alliance is likely to stick together and continue to coordinate on oil supply policy, Opec+ delegates and analysts said on Tuesday.

The UAE is the fourth-largest producer in the Organization of the Petroleum Exporting Countries and said it would quit the group on Tuesday after nearly 60 years as a member. That will free Abu Dhabi from the oil ‌production targets imposed by Opec and its allies to balance supply and demand.

The UAE's exit came as a shock, said five Opec+ sources, who asked not to be named as they ​are not allowed to speak t...