When the AI players starts using nukes they tend to move their units towards the city that got nuked and stop… anyhow their units keep dying in the radiation and they never take the city (they like to keep nuking the same city until they capture it, at least in my games). Anyway, to force the AI player to just sacrifice a unit that has enough movement to get to and take a city in radiation so at least they hopefully stop killing all their own units trying to surround a city in radiation (they keep nuking)?

And I have never seen the AI players make aircraft carriers in any of my games. Anyway, to make the AI use aircraft carriers?