"We have discussed today how to improve cooperation with Iraq on different aspects, especially on oil issues," Zanganeh said.
He said a decline in global oil prices had stopped and that he expected them to rise gradually.
The Organization of the Petroleum Exporting Countries, of which Iran and Iraq are members, and its Russia-led allies agreed on Dec. 7 to cut output by more than expected, despite pressure from U.S. President Donald Trump to reduce oil prices.
The OPEC deal had hung in the balance on concerns that Iran, whose crude exports have been depleted by U.S. sanctions, would receive no exemption and block the agreement.
Ghadhban said any decision relating to future OPEC cuts would depend on monitoring price developments.
(Reporting by Ahmed Rasheed; Writing by Raya Jalabi; Editing by Dale Hudson and Gareth Jones)
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