Frankly, I don't think it would affect the Russian perception of Canada all that much, and even if it did, it wouldn't really matter. The Russian perception of Canada is as an appendage to the United States. From a geopolitical and from a military perspective, the Russians see Canada as a link to the U.S., so whether we are participating in missile defence or not is not going to have any real ramifications in our relationship with Russia, at least not in any meaningful way.
On May 10th, 2016. See this statement in context.