DOHA (REUTERS) - The United States and Gulf Arab allies are preparing to counter destabilising actions in the Gulf, United States Secretary of State John Kerry said on Monday after talks with Gulf states on a nuclear deal between their regional rival Iran and world powers.

Kerry also told a news conference that he and fellow foreign ministers from the six energy-exporting countries of the Gulf Cooperation Council agreed that once fully implemented, the accord would contribute to the region's security.

Kerry said the ministers also discussed missile defence and arms transfers. Additional United States cooperation with Gulf states would include intelligence sharing and special forces training, he said.