Thank you very much.
This has been a fascinating discussion, and I've very grateful to the witnesses for their insights.
Dr. Perry, you've touched on a number of points. When we think about China, Russia and the United States as we move from a clear American homogeneity to a more multipolar world, depending on who you talk to, we think of China as being far to the west and of Russia as being far to the east. When we think about the United States, we think about our southern border. In the Arctic, they're really all right there. They are our neighbours, and they are right across the ocean.
I'm wondering if you can elaborate a little bit on how the defence and security requirements change when we look at these countries from our northern border instead of from our southern border, and on what we need to do.