I'm personally of the mindset that Nuclear Weapons and their likeminded Hydrogen Counterparts shouldn't be in this world. We don't have a rival strong enough to get the nation of Selene to produce them let alone stockpile them. In addition to that most of the rest of the world doesn't seem to have significant IC reason to produce or stockpile WMD's in Selene.
Not only would nations have drowned gobs of money (a strain on any economy) into it but also would have had to conducted tests either underground or in the atmosphere. Either of which would have sent off alarm bells in other nations.
I bring this to the culmination of why nations
should not have WMDs in this world. If one does more will. Proliferation in RP worlds is a serious issue that most region's don't offer sufficient oversight on. For example if Sartoria has it why would Akarus or Seloana or other nations nearby not? They would have a serious potential threat at their doorstep giving them sufficient IC reason to have done or to begin the process of obtaining a nuclear weapon.
On top of the domino effect I'd also worry about the international ramifications of it, such as the radiation in the atmosphere from tests, ground pollution from the tests, also about how quickly war would become near impossible essentially rendering any way a possible nuclear war that would have far reaching effects on all nations and not localized.
Pardon if this was a rant, I'm pretty anti-WMD in RP regions.
This is oriented towards Regional Canon. If it was allowed to run parallel and not canon then I don't really have a preference.