“There is still room for improvement by some participating producing countries,” the group said. “All participating producing countries must promptly reach full conformity.”

Those comments appeared to target, among other nations, Iraq, a major OPEC producer that is producing well above its quota. But it is not clear how easy it will be for the Saudis and others to bring the war-torn country, which desperately needs revenue to address an array of problems, in line.

The meeting also did little to fix the problem of rapid production increases by Nigeria and Libya, two OPEC members exempt from the cuts. Nigeria did agree to carry out some “adjustments,” but only once its sustained output reaches 1.8 million barrels a day. (It is currently well below that level.)

Saudi Arabia said it would cut exports to 6.6 million barrels a day for August, about 700,000 barrels below the levels of a year ago. Analysts said that move represented yet another attempt to influence markets, especially in the United States, a highly visible destination for Saudi crude.