It DOES share a border with Russia. Its north-easterly border abutts Russia's Kaliningrad enclave and Belarus, immediately to the east, is pretty much a Russian satellite.
The worrying levels of nationalism in Russia, and the pandering to that by the Putin/Medvedev régime, makes it even more vital that Poland avoid going down the sort of aggressive nationalistic road that the Kaczynsky brothers pursued and represented when they were in full control of the Polish government and state. Ironically, it was the alternative route of reconciliation and cooperation that led to the agreement to hold the Katyn memorial in Smolensk. Let's hope that the legacy of this horrible accident will be that Russia and Poland further their mutually beneficial process of improving relations.