They are massively increasing their medium sized drone capacities (ie Geran) while improving on those drones too. Faster, harder to detect and shoot down, no GPS/Glonass navigation necessary so jamming won't do much.

A country that is rained on by 500 drones daily delivering 125KG explosives (so like a proper standard bomb dropped from airplanes) can overwhelm local military defense capacities quickly, leave infrastructure in crumbles (as in no water, electricity, gas, heating, gas stations working and so on) and at least in dictator's mind local population may crumble in weeks. You don't need to put a single foot in the country to reduce critical infra to rubble.

I can't imagine Polish folks would ever bow to russians after horrible things they repeatedly done to them, but ie in Slovakia it would be a very quick victory even if country wouldn't be ruled by ultra corrupt folks who would just give whole country to russians for some more corruption promises for later.

If puttin' will try anything in eastern Europe now is the best time. But I would expect more something along Moldova or baltics, Poland is far from russia and any extra force concentration in Kaliningrad would be easy to see.