What is Starshield, SpaceX's military version of Starlink?

Ukraine said Wednesday that Elon Musk’s SpaceX restricted “military-grade” Starlink services, citing impacts on drone strike missions and air defenses. The dispute has reignited scrutiny over the difference between Starlink, SpaceX’s commercial satellite internet, and Starshield, a Pentagon-developed military version. Musk said on X that Starshield systems are owned and controlled by the U.S. government, with any limits on speed or use set by the U.S. military or the president. Starlink relies on more than 11,000 low-Earth-orbit satellites and has roughly 13 million subscribers, and its technology underpins Starshield despite enhanced encryption and dedicated terminals.