Russian invasion of Ukraine

From Twitter POV: OMG oligaRcHs/rOgUe GeNeraLs fLeeiNg fRoM pUrGes/to NucuLar bunka!
From Russia POV: All 6M Routine Tests Completed Satisfactorily

The tweets about the two Il-76 flights to Kaliningrad being full of Tsar Bombas, though. No time for that kind of rubbish. (I am paraphrasing here... I know there's no actual Tsar Bombas. Unless)

although no one seems to know what it might mean

in itself, its pretty typical for a plane to drop off from ADSB coverage when flying over remote areas. ADBS is only good for about ~200mi line of sight at absolute tops and receiver coverage tends to be heavily concentrated in urban areas.

Edit: Also worth pointing out that military planes only fly with ADSB beacons on if they want to be trackable by civilians.