I'll start, Mr. Wilfert, if I may.
I think international peace and security, writ large, is in our national interest. In some particular situations we have more direct national interest in investment and trade. I think we have a national interest in responding to the will of the Canadian people in certain areas. This moves into issues of values as well.
From a political perspective, we have obligations to meet: legal obligations, treaty obligations, moral obligations. I think all of these things are in the national interest.