If I may interject, General Eyre outlined a series of serious threats posed by Russia and China. He gave a medium-term horizon. He talked about 15 years and that kind of thing. We had other testimony from other analysts who suggested that was wildly, or at least significantly, understated, and that threats are much more immediate.
Going back to what General Eyre said, we don't know what authoritarian single rulers like Putin or Xi will do. We cannot predict that, but we know what they say and we can judge their actions. Putin telegraphed that he would invade Ukraine, and he did. China has declared itself an Arctic power, or at least a growing Arctic power. If these are their stated aims, do we not have to take seriously the threats before us? If so, what are the immediate steps we should take in defence to enhance our ability to detect, deter and defend?
I will let you answer that, but I will also let Professor Byers answer.