U.S. Secretary of State John Kerry is talking with officials in Oman about their plans to buy a $2.1 billion air defense system from American manufacturer Raytheon.

Kerry was meeting Wednesday with the Arab country's defense minister, a day after discussions with Oman's sultan.

Kerry thanked them for their decision to buy a ground-based air defense system from the Massachusetts company.

Omani Defense Minister Sayyid Badr al-Busaidi said his country was still in talks with Raytheon. He called Raytheon's system the most effective of its kind.

The U.S. has pushed Persian Gulf countries to create an integrated defense network against the threat posed by Iran.