Indonesia Says U.S. Warship Transit Through Malacca Strait Was Lawful

Indonesia's navy publicly called the passage of the USS Miguel Keith through the Strait of Malacca lawful, turning a routine move through one of Asia's most crowded waterways into a reminder of how closely the region watches great-power naval traffic.

The U.S. warship crossed the strait on April 18, passing near Belawan around 3 p.m. local time and moving northwest at about 13.1 knots, according to AIS data. First Admiral Tunggul, the Indonesian Navy spokesperson, said the transit was consistent with international law and with the right of transit passage in straits used for international navigation, a rule that applies to ships, including warships.

That legal point matters in the Malacca Strait, which is bordered by Indonesia, Malaysia and Singapore and sits at the center of some of the world's busiest shipping lanes. Under UNCLOS Article 38, ships and aircraft enjoy the right of transit passage through straits used for international navigation, while the International Maritime Organization says COLREG Rule 10 governs vessels operating in or near traffic separation schemes. Indonesia also stressed that ships moving through the strait should proceed directly, continuously and as quickly as possible, while respecting collision-prevention rules and coastal-state responsibilities.

The setting gives the episode its weight. The U.S. Energy Information Administration describes the Malacca Strait as the shortest sea route between Middle East energy suppliers and markets in East and Southeast Asia, and the largest maritime oil chokepoint by volume. The Straits of Malacca and Singapore recorded 94,301 ship transits in 2024, a record that underscores why even a single military movement attracts attention. In a corridor only a few kilometers wide at its narrowest point, every warship transit becomes part logistics, part law and part signal.

The Miguel Keith itself is an Expeditionary Sea Base commissioned by the U.S. Navy on May 8, 2021, and named for Marine Corps Lance Cpl. Miguel Keith, a Vietnam War Medal of Honor recipient. The ship is designed to support sea-based expeditionary forces with forward presence and command-and-control capabilities. Its appearance in the Malacca Strait fit that mission, but it also illustrated a larger reality: in the Indo-Pacific, even lawful navigation by a U.S. warship is read as strategic messaging, and Indonesia's public confirmation was as much about managing regional sensitivity as it was about maritime law.