This move by Russia is very clever, isn't it? John J. Miller has a good point, but I have another: They know Obama doesn't like missile defense, so he's sort of trapped: If he follows his instincts, it'll look like he's bowing to Russia's demands anyway- or, at least, they can claim "victory." The only way he "wins" is by doing something he doesn't want to do in the first place.
That is, if he wants to win at all, or even believes in the concept. I don't have high hopes, but, while we may not like war, it likes us very much. Welcome to the big leagues, junior.