Iranian Oil Minister Bijan Zanganeh in a letter to OPEC President warned the members about any increase in oil production.

"Any increase in the production by any member country beyond commitments stipulated in OPEC's decisions ... would constitute breach of the agreement," Iranian Oil Minister Bijan Zanganeh said in a correspondence to OPEC President HE Suhail Mohamed Al Mazrouei, Minister of Energy & Industry of the United Arab Emirates and the President of the OPEC Conference.

"I hereby request your excellency to remind OPEC member countries to adhere to their commitments ... refrain from any unilateral measures undermining the unity and independence of the OPEC," Iranian Oil Minister added.

In his letter, Zanganeh said that unilateral decisions by some OPEC members were weakening the exporting group and that OPEC should not let others take political measures against the group's unity and independence.

"Any unilateral production increase beyond member countries' commitments under the OPEC's decisions would prompt U.S. to take actions against Iran," Iranian Oil Minister noted.

"OPEC decisions by no means warrant any action by some of its member countries in pursuit of the call for production increase by the U.S., politically motivated against Iran and publicly declared", Zanganeh concluded.

OPEC agreed with Russia and other oil-producing allies on June 23 to raise output from July, with Saudi Arabia pledging a “measurable” supply boost, but giving no specific numbers.

OPEC and non-OPEC countries said they would raise supply by returning to 100 percent compliance with previously agreed output cuts, after months of underproduction. That would be roughly 1 million barrels per day of crude oil output increase according to OPEC officials.

The US state department has claimed that it expects the “vast majority” of world nations will comply with Washington’s demand to boycott Iran’s oil.

Meanwhile, Leader of Iran’s Islamic Revolution Ayatollah Seyyed Ali Khamenei slammed all-out US economic and political measures against Tehran in a Saturday address, describing them as futile efforts to turn Iranians against the Islamic Republic.