Excellent exposition. Very clear for the lay person. It's worth adding that China, like Russia, has an infamous history of official, systematic lying about almost everything. Gigantic disasters that would be pivot points in the history of any western country simply vanish. One thing that wasn't clear to me is what is the main motivation for this? Discrepancies in tens and hundreds of meters seem irrelevant for nuclear targeting, but not so for conventional weapons, if they are shooting at GPS points. If someone were shooting at me, I'd love it if they were off by 100 or 500 yards! Is that what it's really about?