Tldr: Poland shot down Russian drones that entered polish airspace. Not the first time they've entered, but first time they've been shot down by Poland.

I wouldn't be surprised if it is deliberate by Russia.

Gray zone warfare in part does small little practically deniable actions, to create a new normal and establish small precedents that can be escalated into larger precedents. Slowly boil the lobster alive - create messaging that conflict in Poland is usual and nothing to wake up about.