Xi Jinping's China sees itself as the rising primary power in the world, soon to take over from the fading old empire of the United States. But it knows its new, rapidly growing military, is untested, and may remain so up until it gets called into action over Taiwan. So it has been taking a very keen interest in President Donald Trump's war in Iran, and took the unusual step of releasing five of the key lessons they have learned from doing so. They are real points, and quite instructive, so let's discuss.