By Enas Alashray, Tala Ramadan and Yomna EhabCAIRO/DUBAI, July 15 (Reuters) - The U.S. struck Iran's coastal defenses and missile sites on Wednesday after reimposing a naval blockade of its ports, while Iran threatened to shut off more regional energy exports, saying it was engaged in an "existential war" with America.The latest escalation of attacks and counterattacks launched by the U.S. and Iran has kept the region on edge days after a fragile truce collapsed, raising the spectre of a return to full-scale war, though analysts generally see that as less likely.

The United States launched on Tuesday a fresh wave of strikes on Iran and President Donald Trump vowed to reimpose a naval blockade, prompting Tehran to respond with attacks on…

US-Iran war news: The United States initiated fresh military strikes against Iran on Tuesday. These strikes target capabilities allegedly used to attack commercial shipping.…