Def stability - its the whole balance of power. You don't want your side going rogue and lose a possible ally but you also don't want to get on the wrong side.
And if they test it - who cares, China tested it, India tested it, Pakistan tested it (after the U.S. and USSR said they would stop). If they use it duh, its a given. But unless you are 100% insane, you wouldn't do so because no one wants to rule over a parking lot.
And anyways it would be in their own interests to keep what nukes they have rathre than sell them. Whats the point of giving it away when you can use it for yourself and give yourself an extra card to play.
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