Saudi Arabia and other major producers are increasingly vocal about the need to reduce exports in order to accelerate the rebalancing of global oil markets (MEES, 6 October). But not all cuts are equal, and Opec’s core Gulf producers are prioritizing key Asian markets at the expense of other areas. Exports to the US initially held up in 2017, but the intense scrutiny afforded to US figures has seen Opec increasingly cut there, to boost oil prices.

Saudi Arabia and Iraq are the two...