U.S. Secretary of State John Kerry met foreign ministers of the Gulf Cooperation Council in Riyadh on Saturday to reassure that the recent warming of U.S.-Iran relations will not affect its relationship with Gulf Arab nations.

"The relationship between the United States and the GCC nations is one that is built on mutual interest, on mutual defense, and I think there is no doubt whatsoever in the minds of the countries that make up the GCC that the United States will stand with them against any external threat," Kerry told reporters after the meeting, according to CNN.

Saudi Foreign Minister Adel Al Jubeir, on the other hand, warned the U.S. of the danger of Iran's mischief. Iran and Saudi Arabia recently severed their diplomatic ties.

"Overall I think the US is very aware of the danger of Iran's mischief and nefarious activities... I don't believe the US is under any illusion as to what type of government Iran is," Jubeir said after meeting his American counterpart, according to Peninsula Qatar.

Kerry also announced that the second round of Syria peace talks will start shortly. The Syria Support Group, comprising 20 nations and groups, will take part in the talks.

"We are confident that with good initiative in the next day or so those talks can get going and that the U.N. representative special envoy Staffan De Mistura will be convening people in an appropriate manner for the proximity talks that will be the first meeting in Geneva," the Secretary of State told reporters, according to Reuters.