“Russia's invasion of Ukraine is an act of aggression, a clear violation of Ukraine’s sovereignty, and of international law. Canada will not recognize a referendum held in a region currently under illegal military occupation.

“We will continue to view the situation in Ukraine with the gravest concern and will continue to cooperate closely with our G-7 partners and like-minded allies.” 

http://pm.gc.ca/eng/news/2014/03/06/statement-prime-minister-canada-situation-ukraine