Almost $11 billion are required in investments to bolster production in Iranian oil fields shared with Iraq along its southwestern border, said Mohsen Khojastehmehr, the Head of the National Iranian Oil Co., said in a statement on the company’s web.

The funds to develop the second phase of the North Azadegan and Yadavaran oil fields, as well as the South Azadegan and Yaran, would help add more than 1 million barrels of oil per day to Iranian crude output from its shared fields with the neighboring Iraq, Khojastehmehr said without elaborating.

International companies pulled out of the Islamic Republic’s energy sector after former U.S. President Donald Trump abandoned the Iran nuclear deal in 2018 that curbed its atomic activities in exchange for economic sanctions relief.

Earlier this month, Iranian Oil Minister Javad Owji said his country would welcome “any investor willing to finance Iranian energy projects and receive crude oil or condensate as payment.

France’s Total S.A. and China National Petroleum Corp. were set to develop a major Iranian offshore gas project in the Persian Gulf before they opted out three years ago because of US sanctions on doing business with Iran. CNPC was also previously involved in developing Azadegan, the largest oil field that Iran shares with a neighboring country, with an estimated 32 billion barrels of oil in place.