What are OPEC and OPEC +, and why has the UAE quit?

The Gulf state is the latest to quit the group, which was created to form a united ⁠front on oil pricing.

The United Arab Emirates has announced its withdrawal from OPEC and the wider OPEC+ framework, removing a core pillar of one of the most influential groups in the energy world.

The Gulf country, with a capacity of approximately 4.8 million barrels per day and signif...