Finally! The Poles have had it with the Russian clown, and Foreign Minister Radosław Sikorski tells the Kremlin,

"You have been warned."

— Meaning from now on, Poland will fire at Russian aircraft.

Full speech: https://www.youtube.com/watch?v=2fgLtZJWNJ4

@randahl this is highly diplomatic language. He does not state that Poland will shoot at every aircraft but he warns that Poland might shoot.
Without strong support of NATO (including the US) Poland can not choose the open threat to retaliate against every incursion into it's airspace.
Europe must do more for it's own defence and we need more airdefence systems and aircrafts and drones and cruise missiles and so on.
I fear that all the money we spend there is needed to fight climate change..

@kriky @randahl If Poland cannot respond to Russians firing weapons at their country, then what's the point of having air defense systems?

There's only one answer: shoot them down.