politics aside (Score 1)

Country A wants to place a missile defense system as close geographically as possible to the launch sites of country B. From a purely military standpoint there is no way country B can allow this to happen without a fight. The system doesn't work! Even if that is the case, there is no guarantee it will remain this way. It doesn't take much thought to see that this system, because of its location, can be used in an offensive manner, and is a direct threat to the defense of country B. How far do you think this would fly if Russia wanted to place the same type of system on Cuba? This isn't even a equal comparison. For that look to the Canadian border as the site location and now it doesn't look so innocent.