I agree with Dr. Lerhe. What you do depends entirely on your future vision. For the sake of safe navigation, responsible resource management, and those sorts of things, RADARSAT is very well suited. If you get into a high-level conflict scenario, those surveillance resources are vulnerable to countermeasures and can be neutralized or even destroyed without too much difficulty. So what you see developing in the future and what is the need that has to be met must be very carefully considered when you go forward. Perhaps it would be a phased plan to deal with the routine administrative, safety, and law enforcement issues first, and then threat and sovereignty issues later, but it depends entirely on how you see the threat.
On October 20th, 2016. See this statement in context.