Russia Has Just One S-500 Air-Defense System. It Arrived In Crimea Amid A Storm Of Ukrainian Rockets.

On paper, an S-500 battery includes three radars—two of which are identical to the radars that cue an S-400. The third radar, the 77T6, is optimized for detecting fast-moving ballistic missiles—like ATACMS. But the 77T6 is just a few years old and shrouded in mystery. The 77T6’s capabilities “remain unknown,” Thomas Withington explained in a 2022 report for the Royal United Services Institute in London.