We've also agreed, for instance, not to do certain types of testing anymore. Just as we could agree to stop training even larger frontier models.
(From WP)
India
In 1998, India said it would only sign the treaty if the United States presented a schedule for eliminating its nuclear stockpile, a condition the United States rejected.[18]
Israel
In 2016, Israeli Prime Minister Benjamin Netanyahu said that its ratification was dependent upon "the regional context and the appropriate timing".[19]
United States
The United States has signed the CTBT, but not ratified it; there is ongoing debate whether to ratify the CTBT.
https://en.wikipedia.org/wiki/List_of_parties_to_the_Compreh...