Sorry, guys, I just don't understand - you are all playing fools, or you really have comprehension problems?
Make me a favour, take a look on a globe. Russian missiles will never fly to America over Europe. Missiles are always launched in direction of Earth rotating. They will be launched on the East - North-East from Siberia and Central Russia. Just few will be sent on West to destroy Europe, and most likely it will be middle and short range non ballistic missiles, defence is useless against them.
And who is talking about that 10 defence missiles. The USA put them there just to shut the mouth of Europe - "We are protecting you against Iran and North Korea attack!". Russia is talking about radar. It is important part of global US defence system, actually it will work as early warning radar. It is necessary part of global sysem because you need to know ASAP characteristic of missiles trajectories on the first part of the fly. And this radar covers the central part of Russia where most of mobile ICBMs are disposed.
BTW, 10 missiles can be very easily changed to 10000 missiles if you have all infrastructure in place.