I'm personally against any missile defense program that doesn't operate by overwhelming international agreement. Russia should have been brought on board as a partner, as everyone else should have. If I recall correctly, they offered the use the Qabala radar in Azerbaijan. Having said that, the performance capabilities of the intercepters deployed in eastern Europe preclude interception of strategic weapons. If Russia's complaint is that they can't target Poland with IRBMs anymore, I don't have a lot of sympathy for their position. Being on the stick end of nuclear blackmail is the worst form of bullying. They know it from experience.
That's the fundamental problem here. Proprietary meddling by great powers has always ended up stomping on the small players whether it be in Central and South America, the Middle East, or Eastern Europe. This sets those weaker countries on the path of looking for a means of answering back. The legacy of these heavy handed policies pushed Poland, the Czech Republic, and the Balkan states into NATO's arms, just as similarly insidious policy from the US has created strong (sometimes violent) sentiment in various parts of the world.
The ideal for long term stability and security is to see all nations in the world equally held to account for the damage they do by their choices on the international stage.