"given recent events the United States concern is warranted so Russia's reaction is unreasonable."
Yes and the US has been working on this missle shield since...?
If I point a gun at a calm bear saying it's to defend myself from the bear and the bear gets violent how do you know which is true; that the bear, though appearing calm, was always violent so I pointed my gun at it in preparation, or that the bear was actually calm and only got violent because I was pointing my gun at it.
I have no position either way all I know about the missle system is that initially former Canadian Prime Minister Paul Martin was against it in a rare act of Liberal Party pragmatism saying, "We don't need it, nobody's shooting at us. Besides we've already got NORAD." Whether he changed his mind or it changed with Conservative Prime Minister Stephen Harper I never bothered to figure out because I really don't care. Either we have American missles to stop enemy missles that will never come or we don't have American missles to stop enemy missles that will never come; it really doesn't make a difference, unless we're paying for the missles then there's a slight difference.
There are 10 kinds of people in this world, those who understand binary and those who don't.