Still waiting for a confirmation on this one, but current rumor is that an FSB site was hit by a drone about 15 minutes ago.

In Moscow.

This footage is reported as Balashikha, a suburb of Moscow. Smoke after drones reportedly hit an unknown site about an hour ago. pic.twitter.com/tAKoc6XQMh

— NOELREPORTS 🇪🇺 🇺🇦 (@NOELreports) May 31, 2023