Yes, you are correct in saying that in the past, the U.S. has done so, and the possibility of it doing it again in the future is not something that could be excluded. We know that this spring the President issued an executive order on shipbuilding that also includes a tasking to the Department of Defense to secure Arctic waters without clarifying what the waters are.
In terms of the Canadian response to a U.S. sailing that is unauthorized, if I can put it that way, I'd rather not say what the position is or what the response would be at this time.
