What are you defending the Russians? THEY are the ones who've done the "neighbor attacking" over the past many decades.
This fear has lead to Russia doing a lot of odd and silly things in their history. By putting anti missile bases in their sphere of influence, we are feeding this traditional fear. I honestly suspect someone in the Pentagon knew this, and that was the goal. The missiles won't stop a full on Russian attack (unless their capabilities are a lot smaller than we have been led to believe), but it will get them all fired up.
Read history and strategy. Russia is acting like Russia again.