At this moment (08:30 CET), two USAF Boeing B-52H bombers (reg. 60-0023 & 60-0040) are en route to the eastern Mediterranean.
The two bombers took off from the UK’s RAF Fairford base, where they arrived last week from the United States. They were refueled east of Sicily by four Boeing KC-135R tankers, which also departed from the UK, and are now continuing their flight eastward.
Periodically, USAF bombers are deployed to the UK, from where they conduct demonstration missions over the Mediterranean, the Middle East, and Eastern Europe.
only one was visible on radar
Presumably these tracks are self reported from ADB as ATC still wants to know where they are, and the mission is overt deterrence demonstrated capability.
Impossible to know if Hamas, Hezbolla or Iran are watching…