I would only add, to be brief, that I understood your question to be largely about enforcement. Enforcement is tricky, even in commercial cases. Even in normal, ordinary cases, it's always a challenge. That being said, enforcement need not be a matter of consent. Iran, for instance, would not necessarily have to consent to the enforcement of a judgment against Iran. We could just go ahead and execute a judgment, for example, targeting non-diplomatic assets held by Iran in Canada. The reality is that countries have investments everywhere, and these would be fair game, so to speak.
On March 10th, 2011. See this statement in context.