“Islamabad is producing fissile material, adding to related production facilities, and deploying additional delivery vehicles. These steps could enable Pakistan to undertake both quantitative and qualitative improvements to its nuclear arsenal,” according to congressional analysts.
Neighboring rival India holds between 60 and 80 warheads in its atomic arsenal, according to the report.
"Whether and to what extent Pakistan’s current expansion of its nuclear weapons-related facilities is a response to the 2008 U.S.-India nuclear cooperation agreement is unclear. Islamabad does not have a public, detailed nuclear doctrine, but its ‘minimum credible deterrent’ is widely regarded as designed to dissuade India from taking military action against Pakistan," the February document adds.