If there are any difficulties for individuals in a company, the immediate protective mechanism would of be through consular relations. There are also mechanisms available in international law to protect companies that have been adversely affected or targeted by the host country in matters that are inconsistent with international law. A company could file a claim against the state in question. They would first have to go through the necessary court proceedings in that state.
If these are ineffective or unavailable, the company could then turn to the Canadian government, with a view to having its claim against the host state espoused. If the claim meets the criteria that exist in international law for the espousal of a state, then Canada could take that claim as its own, raise it to the diplomatic level, and take it as far as the International Court of Justice.
This doesn't happen often, but those are the mechanisms that are available. In a lot of cases, an expropriation matter, for example, would get settled through diplomatic channels. It might include reparations or other forms of dispute settlement.