If you are talking about internationalism in terms of the idea that countries should cooperate with one another, then I would say that Canada should do this. Canada does not really have the power to try to force other countries to do what it wants. Besides, it is not really easy to force other countries to do what one country wants.
Because of these factors, it seems to me that internationalism is the best course of action for Canada. As a country that is not a huge power, it does not really have enemies. It, therefore, ought to be able to work with other countries and get them to come around to its vision for various issues confronting the world.