Im pretty sure Japan has Aegis.
Japan definitely has Aegis. They have been on several missile shoots off Kauai hitting ballistic missile targets in the last few years.
Some of their naval vessels are based on our Arleigh Burke destroyer design. They carry Aegis gear, though I'm not sure if the systems are updated to the level that allowed a satellite intercept. With the Japanese government making these comments, I suspect they're up to the task.