I think economic relations between Poland, Russia, and Lithuania would be excellent. Plane crashes and airspace violations are silly.
(That said a freind of mine's brother is an airforce pilot and he says 'accidental' violations of airspace are usually anything but accidental, and extremely common)
The pilot was flying an approved route to Kalingrad, and lost his electronics and direction. Finally, the only thing left for him to do was to bail out and let the plane crash.