Realistically these UFO's aren't alien crafts but hostile spy drones. Perhaps the reason we haven't heard about these drones before could be that the US has never felt the need to act (the spying poses no real imminent threat), or maybe the hostile state sending the drones only now feels the need to spy on US military bases.
But however you look at this either the US is suddenly much more concerned about someone spying on their military bases, or some state suddenly feels the need to spy on US military bases.
We also know that NATO countries now seem to be willing to arm UA with weaponry not just capable of putting up a decent defence against Russian forces, but actually pushing them back into Russian territory. It seems the US and allies no longer just wants UA to hold their own against RU, but actually win the war.
Imo if UA is able to push RU back they're likely to try to reclaim annexed territories back from RU. It seems likely the US and allies would understand this is a probable outcome. After all would NATO countries be sending tanks and such expensive weaponry if they thought UA had no chance? It seems likely they are betting on a UA victory and all that entails.
Most experts agree the conflict in UA will pick up again in the spring. And in the event of a potential UA victory the use of tactical nuclear weapons from RU seem likely.
If the US knows RU is likely a couple of months away from using nukes in UA then perhaps this would explain why they're suddenly so worried about these spy drones, or why there's been a sudden increase in them.
Maybe I'm making too many assumptions here, but it just feels like there's lots of chess pieces moving in worrying ways right now. This request being yet another.
Am I wrong to be concerned?