Neither one of those is likely. In fact, they are near impossible, if not so.May be this was the only city in range of nukes for those civs ? Here it must be taken into account, that the AI cannot move nukes properly. Another reason could be, that those AI civs haven´t yet discovered other cities of your civ.
I'm pretty sure they both had ICBM's, which can hit anywhere in the world. Also, the island-city was part of an archipelago, and I had two other cities on nearby islands about 5-6 squares away, so even if the nukes were submarine-based, it's highly unlikely that these other cities would not have been in range.
As for that island-city being the only one visible to my opponents, that is simply impossible. For starters, this was in the end-game, long after world maps had been traded many times. Also, Russia was right next to my Civ and had done air strikes of some of my other cities long before this happened. France was further away, but had also air attacked one or two of my other cities prior to this.
I'm pretty sure I've seen this type of AI behavior in the past, but never to this extreme extent. Been playing this game for 20 years now. Not really important in the overall scheme of things, since I won the game handily, but just a curiosity.
Maybe the only other thing worth mentioning is that this island-city was the last Capital of the Spanish (not Madrid), after they had lost all of the rest of their territory to the Russians earlier in the game.
As I'm wont to do, I later took the city myself. Having thought about this, I'd forgotten that I earlier took the city from the Spanish, not from the Russians, eliminating the former from the game. Then later, in a war with Russia, they nuked the bejesus out of it. And then the French later did too.
I dunno, maybe the AI was angry that I had taken the final Spanish city? Sometimes things happen in this game that almost make the AI seem sentient.
Okay, one other thing. At the time this happened, I had just passed the Russians in the overall score of the game. I had started the war against Russia too.
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