The LAC site says "Do you ever wonder who your first Ukrainian ancestor was and when he or she left the Ukraine and arrived in Canada? Are you curious about your family’s Ukrainian heritage?
If so, the Library and Archives Canada is a great place to begin your research.
For instance, you will find a page specific to genealogical research at http://www.collectionscanada.gc.ca/genealogy/022-905.010-e.html
It provides you with historical background information, archival and published material from the collection, as well as links to other websites and records".
Toronto Ukrainian Genealogy Group http://www.torugg.org