Re direct military conflicts between nuclear weapons states: this might not exactly fit the definition of “direct” but I enjoyed skimming the mentions of nuclear weapons in this wikipedia on the yom kippur war, which saw a standoff between Israel (nuclear) and Egypt (not nuclear, but had reportedly been delivered warheads by USSR). There is some mention of Israel “threatening to go nuclear” possibly as a way of forcing the US to intervene with conventional military resources.
Re direct military conflicts between nuclear weapons states: this might not exactly fit the definition of “direct” but I enjoyed skimming the mentions of nuclear weapons in this wikipedia on the yom kippur war, which saw a standoff between Israel (nuclear) and Egypt (not nuclear, but had reportedly been delivered warheads by USSR). There is some mention of Israel “threatening to go nuclear” possibly as a way of forcing the US to intervene with conventional military resources.
Interesting, thank you! I hadn’t been aware of this case.