America has responded by saying that the missile-defense system is not intended to defend against a Russian arsenal, but against a potential attack from Iran or a rogue threat.

• 美国方面对此回应说，美国建立导弹防御系统不是为了防御俄罗斯的军备，而是为了防御来自伊朗或无赖国家的可能袭击。