Canada will  do exactly what US and UK will do. All parties in the parliament agree on this mission. It may backfire if there is another reversal of government in Ukraine. The current Ukrainian government has hardly any support by the population.
The western Ukrainians clamoring for access to EU will be disapointed. There is minimal support in EU for the sanctions against Russia. This will be changing soon.
As for Donbas and Luhansk the Ukrainian government needs to decide if they want them in or out. Russia does not want them in so they will either stay in limbo or rejoin Ukraine when Minsk conditions are met. All the levers are in Russia's hands. Ukraine is fated to beg for western support.