According to Seymour Hersh, the nuclear arsenal in Pakistan is de-constructed. Where nuclear warheads and the triggering mechanism are stored separately. The ISI in charge of nuclear safeguard, will not reveal to US CentCom generals the location of warheads or 'lock-key' triggers. Anthony Cordesman no slouch in his own right, has written that the CIA has good intelligence on Pakistan's arsenal. But the fear revolves around lower-level or rogue Pakistani commanders. Which are corrupt and support the Taliban as a hedge against their mortal enemy India.
UN envoy to Yemen says warring parties increasingly open to peace plan (Reuters)
from the article: With all eyes on Iran, who's watching Pakistan's nuclear arsenal?