If you take even a quick look at the map below you might see the problem with the Ukrainian missile errantly straying into Poland when it was allegedly fired at incoming Russian cruise missiles.
How did a anti-aircraft missile find itself in Poland since Poland is not really in the flight path for any Russian cruise missiles?
Russia is using its latest and best cruise missiles against targets in Ukraine and they are doing it repeatedly and the Ukrainian air defenses are allegedly improving against these attacks. The way you improve is by studying most carefully the previous attacks and working out how to defend against them with missiles and electronic counter-measures. You know who would be real interested in just how both sides are working out the teething problems of new missiles and new air defense techniques? That's right, NATO.
There is almost certainly an AWACs or later generation ECM aircraft keeping a focused eye on the airspace in and around and above Ukraine and every single thing that moves through it is tracked and monitored in real time. NATO would know instantly if the missile that killed two Poles in Poland was launched by Ukraine or Russia. That whole bit of fake outrage at Russia was just gas on the fire hoping that somebody would propose shooting at the Russians ourselves rather than leaving all that to the Ukrainians, mercenaries and hundreds of NATO 'advisors' that are 'assisting Ukraine's armed forces with exotic weapons they never saw before in their lives. You know, all those German tanks, HIMARS and Javelin missiles and all that artillery NATO sent them.
I believe that there are thousands of people in DC and other NATO capitals thirsting for a chance at a nice little war with Russia since they perceive depth as weakness. They're stupid but they are convinced that with the right trigger they can pull off another Tonkin Gulf incident and drag us kicking and screaming into a war with Russia.