On Tuesday, the Iranian Revolutionary Guard Corps forcibly commandeered the Maersk Tigris as navigated its way through the Straits of Hormuz. Iran controls the strategic waterway through which 40 percent of seaborne oil and a quarter of seaborne gas transits to global markets.
The Maersk Tigris is flagged to the Marshall Islands. The South Pacific archipelago gained its independence from the US in 1986 after signing a treaty conceding its right to self-defense in exchange for US protection. According to the treaty, the US has “full authority and responsibility for security and defense of the Marshall Islands.”
Given the US’s formal, binding obligation to the Marshall Islands, the Iranian seizure of the ship was in effect an act of war against America.