First, the Arctic Council doesn't have anything to say about security and defence, except for things like search and rescue. But the country that is chairing the Arctic Council could at least give a sort of list of priorities of what kinds of activities should be developed, especially when dealing with environmental, social, and economic development issues. This doesn't have an impact directly on defence and security, but at least it would give you diplomatic leverage to attract attention to this or to lower the attention paid to it. That's what the Canadian government seems to be doing right now.
So there's no direct relation with defence in the Arctic Council.