That is troubling. Why over Kaliningrad I wonder?
Keeping an eye on Russia...
The following articles are dated but might explain what is perhaps- a routine mission.
NATO’s Worst Nightmare: Russia’s Kaliningrad Is Armed to the Teeth
Russia deploys Iskander nuclear-capable missiles to Kaliningrad: RIA
Routine spying? Two US surveillance planes peek over Russia’s Kaliningrad borders
https://www.rt.com/news/425989-russia-kaliningrad-spy-planes/