There is currently no system in place for a nation to claim the possession of nuclear armaments as dialogue was held in the Council of Altera in efforts to prohibit the possession of nuclear armaments. One resolution was put to a vote, but it did not pass on the grounds that the wording of the resolution rendered it insufficient and useless. A draft for a replacement resolution was then proposed, and discussion was held for ensuring sufficient wording of the replacement resolution. However, this replacement resolution died in discussion due to the appearance of other events and a lack of changes from the proposer of the replacement resolution: myself.
I've finally submitted a final version of the replacement resolution to put up for vote, thanks to your reminding me that said resolution has faded into obscurity. If the resolution passes, then no system will be implemented for claiming nuclear arms as nuclear arms will be banned. If the resolution passes, then we'll have to figure out a system to implement. Until the vote, though, there is no system as the need for said system is still in question.