Foreign interests, no. I don't think that's his motivation. I think he doesn't want a war declaration because that implies a possible end to the war, and with that go all the new war powers. His administration has already openly stated on several occasions that the war on terror is going to last all our lifetimes, or forever, depending on which statement you go by. Besides, if war were declared, enemy pow's would be protected by the Geneva Convention. I don't think he wants that either. But if we're going to sign treaties, we have to honor them, or formally withdraw from them. This signing treaties, and then ignoring the Constitution by not declaring war so we don't have to honor them when we don't feel like it doesn't fly.
The insurance policies were just icing on the cake.