That’s fine. When Russia starts flexing their muscles in the Arctic (Hello Losmonov Ridge), and Canada is looking for someone to support their claim, maybe they can call China?
The U.S. is amongst the countries flexing their muscles in the Arctic. Canada realizes that its only hope is that the disputes will be settled by rule of international law, rather than diplomacy by other means.
Canada offered the oil to the U.S. — the U.S. refused to take it. What are we supposed to do? Sit on it, in case some day the U.S. might decide that it wants the oil sands oil after all?
Over the past several years, I've posted several lamentations about the U.S. leftist-sponsored international environmentalist organizations, which are bent on shutting down all oil-sands production. I've also posted about the collection of big-city mayors, and state governors, who were taking or considering ways to boycott the oil-sands oil.
If the U.S. wants the oil — you have only to ask. If you don't want it; why would you even care what we do with it?