Cold War heroes Lech Walesa and Vaclav Havel, along with 20 other European leaders and intellectuals, have written an open letter to Barack Obama pleading with him not to cave in to Russia and give up on missile defense.
[T]he thorniest issue may well be America’s planned missile-defense installations. Here too, there are different views in the region, including among our publics which are divided. Regardless of the military merits of this scheme and what Washington eventually decides to do, the issue has nevertheless also become — 
at least in some countries — a symbol of America’s credibility and commitment to the region. How it is handled could have a significant impact on their future transatlantic orientation. The small number of missiles involved cannot be a threat to Russia’s strategic capabilities, and the Kremlin knows this. We should decide the future of the program as allies and based on the strategic plusses and minuses of the different technical and political configurations. The Alliance should not allow the issue to be determined by unfounded Russian opposition. Abandoning the program entirely or involving Russia too deeply in it without consulting Poland or the Czech Republic can undermine the credibility of the United States across the whole region.
