Well, I suppose sometimes you get into difficult questions about sovereignty, and these may be people with dual nationality. It is certainly open to governments to tax their nationals, even when they're living abroad. You start to get into some complicated legalities here, which Justice lawyers and others would need to work through. Clearly, as an important starting point here, we have one of the most pre-eminent sources of international authority in law—the UN Security Council—saying, “End this and take action”. I would say it's therefore incumbent upon Canada and all other countries to explore the ways to do so lawfully.
On February 9th, 2012. See this statement in context.