The clear suggestion is that it is Russia doing it. Other than as an f-u, I don’t understand why they would though. If I have an effective weapon (GPS spoofer), surely I don’t want to alert the enemy to it, lest they develop defences. So eg say NATO were overreliant on GPS, incidents of spoofing like this will cause them to rethink and reduce that reliance, or harden the system.
Russia has done this for the past 10 or so years. They invaded EU airspace. They executed many cyber attacks. This is strategy. They test to see if their competence works, they test to see what the reaction is, and they sharpen their knives, get better at it.