Hi Eagle.

The reason China and Russia are upset is because of MAD, Mutually Assured Destruction. This was the Idea of the US and basically states that even if you blow the hell out of me, I can kill you in return so both sides are deterred from striking first. They are worried that if the United States has a missle sheild, they will be able to use Nuclear weapons without fear of retaliation. As we have pointed out, the SDI system is both overkill and inadequate for defense against so called rogue states. China and Russia fear that the missile defense is to allow the US to attack them with impunity. I think their fear may be justified. If a terrorist country wants to Nuke the US they will send the bomb by ship.