I had the South African's getting involved in the Twiilght War directly because of the Soviet's policy of hitting neutrals that could support the US with either ports or oil - and having a very pissed off South Africa then use its nukes (which given the political environment of the Soviets holding together they most likely wouldnt have gotten rid of) on Mabuto and Angola's capital and then joining the war as a US ally as a direct result of the Soviet strikes.
The nuke strikes in Angola gut the Cuban air power there - and as a direct result the South African's win leading to the Cuban evacuation you see in Gateway to the Spanish Main
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