Certainly - The Chinese and the Soviets had sporadic border skirmishes from 1969 until May 1991, when they signed a treaty formalizing the borders and withdrawing troops from the area. This isn't something that's really well known because, well, neither party was real interested in publicizing it when they were attempting to present a united front on Vietnam. The worst of the fighting was 69 to about 75. (Google for Sino-Soviet Border Clashes or Wars.)
Anyway, at the height of the border wars, there were a number of inexplicable seismic events localized to that area that had the unmistakable signature of a nuclear weapon. One of them could have only been a nuclear detonation, the others could have either been nukes or enormous conventional explosive charges. Judging by the size, per experts, the devices were of the tactical nuke class. (There's a couple of books on the subject; titles completely escape me at the moment.) The background radiation count also went up, but other than that, there was no proof that anyone had done anything - no point in announcing it.
The general consensus seems to be that about 5 atomic or nuclear weapons have been used in anger, including ours on Japan.
NK would not use a nuke in anger, but in glee.
Ditto Iran
What .. 2 in Japan and 3 on the Soviet-Sino border wars ?
Wasn't there also an unexplained nuclear detonation underwater in the Indian Ocean right about the time that Taiwan, SouthAfrica and Israel were rumored to be collaborating on a nuke?
So I'm guessing these were "Small" nukes designed to target troops? Or are there towns and villages in that area that have mysteriously disappeared from the maps?
If the titles or a link to the thread come to mind at some point- would you mind dropping me a ping? I have heard rumors of this- and my Googling on the subject has been less than spectacularly successful. :-)
I knew Sino-Soviet relations went sour soon after Stalin died and things heated up and there were years of border clashes. That nukes were used is news to me. Do you think both sides used nukes or just one? I think the Soviets had more advanced technology and the Chinese didn't "officially" test a nuke until sometime in the 1970s. Who knows what unofficially happened.
I'd also appreciate a *ping* on this if you do turn up any solid resources. I've heard vague rumors about this for years, and have never seen anything concrete.
Thanks!