It was back in the early 90s, right after Clinton gave them (as a freebee) the Klystron Switch so the Chinese could make working thermonuclear weapons (this was after Loral gave them the guidance systems for their ICBMs).
One of the military pages of the time carried the story, perhaps Stratfor, the Chinese, after testing their first couple of hydrogen bombs, went right for the neutron bomb. Clinton had just ordered US ICBMs to not be pre-targeted and the targeting cards removed.
Dr. Ed Tellar, urged Clinton not to make neutron bombs, and so it was.
Meanwhile, the Chinese pushed ahead with their program, testing the weapon on remote villages in the muslim regions - twice. Worked as advertised, making China the only known country with neutron bombs.