In the US we are deploying ATOPS which gives a radar like view of aircraft with some automated conflict probes.. It is however NOT radar.
As to the long range radar you speak of, it was run by the Air Force and called Pave Paws. Due to cost, it was run part time for many years by the Air National Guard. I have lost track on if it is still in use or not due to cost issues and the demise of the USSR and the percieved threat being gone.
regards
Scott