Advisory from Canadian Government:
Crimea: Global Affairs Canada advises against all travel to Crimea, including transiting through the airports in Simferopol and Sevastopol. Canada does not recognize Russian control over Crimea, and our ability to provide consular assistance to Canadians in Crimea is extremely limited.
Donetsk and Luhansk Oblasts – Avoid all travel
Global Affairs Canada advises against all travel to the Donetsk and Luhansk Oblasts due to armed operations in the area. If you are presently in Donetsk or Luhansk Oblasts and are unable to exit the region safely, remain indoors, maintain a low profile and avoid large crowds and demonstrations.
https://travel.gc.ca/destinations/ukraine