The conflict has opened a second front in the Middle East after the United States and Israel attacked Iran, adding to global uncertainty and turmoil in energy markets.
The Iranian-backed militia was engaged in fierce battles with Saudi-backed government forces in Yemen on Sunday, as it seeks to maintain momentum in the war.
Smoke rising from the fuel storage depot at King Khalid International Airport in Riyadh, Saudi Arabia, on Saturday. The Houthis said they had launched missiles and drones at the Saudi capital.
The American presence in these countries has not shielded them from retaliation during the Iran war. Now they are hoping direct talks with Iran could help.
Smoke billowed from an oil refinery in Bahrain after an Iranian strike in March. The U.S.-Israeli war with Iran has exposed the vulnerabilities of Gulf countries like Bahrain.
The kingdom is in a state of strategic shock after coming under attack from an emboldened Iran and failing to win more U.S. military support, analysts say.
The Iran-backed militia routed Yemeni government forces in Mokha, putting the group in a stronger position to attack ships in a crucial waterway for global trade.