I know, right?
But in all fairness I was really only experimenting, as I had never done that before as long as I have owned the game! I wanted to see what it looked like, and exactly what sort of devastating "diplomatic penalties" Egypt would incur for using the Bomb. A couple of leaders "denounced" me, and when King William of the Netherlands (yes, they are a civ from the expansions) would contact me for trade, where it showed his "mood" it said "AFRAID" after that, instead of 'NEUTRAL" or 'FRIENDLY" or something like that. Thought that was pretty funny. But I do not imagine anyone in the World Congress making any motions short of a total embargo on Egypt and most of them voting in favor.
Of course, it does show which civ's delegates at the World Congress/U.N. voted in favor; it is not a secret ballot...I could therefore nuke the bastards just to teach them not to vote against Egypt next time...
In toto, I think I nuked (and halved the populations of) Samsun, Bursa, and Istanbul. When I tried to make peace with Suleiman, he just wasn't having it. Surrounded Bursa (mostly full of nuclear fallout and shattered dreams of Empire) which I had negotiated from him in exchange for Peace last time I nuked it, and besieged it. You can "besiege" a city if all routes into it, including any harbor, are blocked by your troops/ships.
When you take over a city (I am telling this for the benefit of those who don't have it and might be interested) you have three options" raze it (it gradually burns down over 3 turns giving you the option to cancel the razing), create a puppet state (it's your territory but you cannot control what it is building) or totally annex it (as you did with Civ IV but you only could raze it or annex it). The happiness of your entire empire goes down a few notches if you make it your puppet state/territory but do not directly annex it; and goes down quite a bit if you actually annex it. Of course if your empire's happiness level is pretty high already who cares if you grab it like a greedy little bastard (such as moi). I think this prevents too many cities from being taken over, or one civ turning into a giant juggernaut that rolls up the whole board.
Actually there is a fourth option: if the city had originally been owned by a third party, or it used to be a city-state that that empire itself annexed, you can choose to "liberate" it back to its rightful owners. They become very friendly to you and you receive neither the hit to your happiness, nor will you incur the "warmonger" penalty. I think that's all part of the original game, in fact.