After all, Canada is one of the biggest oil producers in the world. That may not be a good thing for an environmentalist like me, but it's still true.
That said, I think it would violate international law if the U.S. were to impose sanctions on a country that has bilateral relations with Cuba, as Canada does, if it sent oil to Cuba, for example. That would violate international law. However, I think the worst consequence of all this is it would sort of push the Cuban government into the arms of other countries, such as Russia.
If a country doesn't want to give or sell oil to Cuba, then Cuba has to turn to other countries that aren't necessarily the most respectable. However, if you have no other choice, at some point, that's what happens.
Do you agree with me that it's a very bad idea to prevent Canada from providing oil to Cuba?