That is not part of the coast guard's current mandate. If I may, I would add to what the commissioner said and point out that the coast guard used to have six icebreakers in the Arctic, including one dedicated exclusively to the western Arctic. Since the Amundsen's arrival in 2003, generally speaking, two units have patrolled the waters in the western Arctic every year, including the Beaufort Sea. The Amundsen and the Pierre Radisson have been in the western Arctic since 2003. That is an additional unit intended to provide emergency response at the government's request.
On March 1st, 2011. See this statement in context.