Establish a "zone" along the Polish/Ukraine border, firmly set the lines clear for Russia, anything in Polish airspace = Liquidated, anything close to Poland's border within a certain amount of KMs = Liquidated. Tell Russia to fuck off and find another route for their missiles that doesn't come dangerously close to Poland or actually violate Poland's airspace.
This could be the first step for French forces even, not troops in Ukraine but can we actually protect our fucking borders?