US Secretary of State John Kerry focusing on Iran, Syria during talks in Abu Dhabi

U.S. Secretary of State John Kerry steps aboard his aircraft in Geneva, Switzerland, Sunday Nov. 10, 2013. Nuclear talks with Iran have failed to reach agreement, but Kerry said differences between Tehran and six world powers made "significant progress." (AP Photo/Jason Reed, Pool) (The Associated Press)

U.S. Secretary of State John Kerry is focusing on Iran and Syria during meetings in Abu Dhabi with Emirati officials.

Kerry arrived in the United Arab Emirates on Sunday after a marathon but inconclusive negotiating session in Switzerland about Iran's nuclear program.

The UAE is a valuable American partner in the Gulf. Like other Arab states in the region, the UAE is deeply concerned about Iran's nuclear ambitions.

Kerry plans to return to Washington on Monday after his talks in Abu Dhabi.