There's not an agreement in the strait, but it's an odd kind of agreement in the Strait of Malacca. It does not actually guarantee rights. That is an open ocean that any country, any state, and any vessel can go through. There's not an agreement per se with the Strait of Malacca.
There is a complex agreement between the strait states and some of the user states on the somewhat voluntary arrangements dealing with navigational aids. I was using that as an example of what is seen as an international strait by the United States, and why this is important, not necessarily that the Northwest Passage is or is not an international strait. The Canadian view is not the U.S. view that it is. As for the St. Lawrence Seaway analogy that we've read about numerous times, there are some very difficult political and legal issues that would have to be sorted through very carefully.
I am sorry, sir, but that's about as far as I can go on that. I have views on the law and can tell you about the law to answer those kinds of questions, but on the more speculative things I respectfully decline to respond at this moment.