Our main reason for having the station there would be the defence of Canada, the defence of the homeland, and the defence of North America.
Our primary sharing is with NORAD. From my perspective, we figure out what's going on. We produce that intelligence. How our national command might then decide to share that or any other source of intelligence with somebody else, because we have a common problem we're dealing with, on a case-by-case basis, is echelons above me. Here's the information into the hopper, and somebody else decides whether my information or some other bit of information needs to be shared with somebody other than the people we regularly share with, and that is ourselves and NORAD.