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@uhoh pointed to a tweet by LaunchStuff that shows images of what appear to be several Chinese notices to airmen (NOTAMs). (Weirdly, I can't find the originals of those; they don't seem to be in the international airman notification system, nor the corresponding system for notices to mariners) They show three danger areas, one of which is near Guam:

Note Guam to the far right.

The nearest corner to Guam was about 150 (statute) miles from Guam:

But it was a lot closer to Tinian and Saipan in the Northern Mariana Islands, which are definitely populated: 65 statute miles.

The two eastern areas are on either sides of populated islands in the north of the Philippines, and come even closer: (35 sm)

The Google map behind those images is available here. (does anybody know how to switch it to nautical miles or km?)

I've attached the image from the tweet below in case the original goes away. The data is: