The United States and Iran have resumed hostilities after four days, and the front lines are expanding across the Middle East. The United States launched airstrikes on Iran citing the attack on a Jordanian military base as the reason, and Iran declared retaliatory attacks on US facilities and attacked the Jordanian military base. Iran is also escalating the war through guerrilla-style attacks, such as attacking pro-Iranian militias in Saudi Arabia and Iraq. While the United States seeks a solution through negotiations with Iran, there are no tangible results yet, and the possibility of a full-scale war cannot be ruled out.