TEHRAN (Kyodo) Iran has warned Japan of a possible move to seek joint development of its giant Azadegan oil field with Russia or China if it cannot reach an agreement with Japan by Sept. 15, a local news agency reported.

Mehdi Bazaargan, managing director of Iranian developer Petroleum Engineering & Development Co., expressed concern over sluggishness on the part of the Japanese government-linked Inpex Corp., which holds the concessions for the development project.

He was quoted by the news agency run by Iran's Oil Ministry as saying his company may explore developing the field with other countries, including China and Russia.