Dr. Doran, I shall follow up on comments you made with respect to Russia and sanctions, which I thought were very interesting. You also raised the question of deterrence. What do you have in mind there? I ask this because of course we've had sanctions in place, and I think the west—Canada and the U.S. in particular, and Europeans as well—have taken a tough line on what has happened there. But we've also seen a commercial airliner blown out of the skies with really no repercussions. If a state is prepared to do that and gets away with it, I'm curious to get a sense of what you might have in mind, because I think you're on to something. If you have a sanction that could result in a backlash or aggressive action, you need to think ahead and prepare for it.
Could you expand on your thoughts a little bit?