The idea could be something along the lines of real life... there were plenty of conflicts where nukes weren't used but certain nations still engaged in warfare. The idea might be to obtain the alliance of one of the nuke-carrying nations so you can battle with approval of one of the nuclear club. The alliance can be made public, so if someone uses nukes on that nation, the allied nation uses their nukes on them.
If 2 nuke nations are at war, it must be assumed that if nukes are launched to obliterate that one nation, an automatic return volley will be sent and that will wipe out the nuking power as well.
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