The United States and Iran signed a memorandum of understanding (MOU) to end the war and agreed to continue further negotiations for 60 days, but they fought over control of the Strait of Hormuz, a crude oil transport route in the Middle East. While both sides claim that the other party “violated the agreement first,” some point out that the MOU, which was hastily signed under vague language, exposed its limitations. Additionally, concerns are growing that if armed conflict continues, it will have a negative impact on subsequent end-of-war negotiations. According to Reuters, the United States and Iran exchanged airstrikes several times between the 26th and 28th (local time), heightening tensions that had barely calmed down after the signing of the MOU. This collision occurred on the 25th when the Iranian Revolutionary Guard attacked the Singapore-flagged ship ‘Everable’, which was trying to exit the strait using the Omani sea route south of the Strait of Hormuz, rather than the northern route of the Strait of Hormuz, which is closer to Iran. The United States conducted an airstrike on Iran's missile and drone storage facilities on the 26th. Iran also attacked Bahrain, where a US military base is located. The United States conducted airstrikes on Iranian military facilities on an expanded scale on the 27th.