allow Islamic law , or sharia , in the Swat Valley , in exchange for an end to fighting . Still , Pakistan 's military is continuing an assault on militants in Taliban-held areas after they seized territory in violation of the agreement signed by Zardari . Last week , U.S. President Barack Obama said Pakistan 's government appears to be `` very fragile '' and argued that the United States has `` huge national security interests in making sure that Pakistan is stable '' and does n't end up a `` nuclear-armed militant state . '' And , after making two visits to Pakistan in the last three weeks , Adm. Michael Mullen , chairman of the U.S. Joint Chiefs of Staff , indicated Monday that he is `` gravely concerned '' about recent Taliban and al Qaeda gains across much of southern Afghanistan and in Pakistan . Pakistan 's nuclear weapons are `` definitely safe , '' Zardari said Tuesday . `` First of all , they are in safe hands . There is a command and control system under the president of Pakistan . And Buner ... there has been fighting there before . There will be
-LRB- CNN -RRB- -- Pakistani President Asif Ali Zardari on Tuesday insisted that his country 's nuclear arsenal is `` definitely safe , '' despite growing concerns about recent gains by the Taliban along the country 's border with Afghanistan . Pakistani President Asif Ali Zardari insists his country 's nuclear arsenal is `` definitely safe '' from militants . In an interview with CNN 's Wolf Blitzer , Zardari responded to the fact that the United States does n't know the locations of all of Pakistan 's nuclear sites . He also addressed the Obama administrations concern over whether the weapons are vulnerable to Taliban fighters who are gaining control of some border regions . `` They ca n't take over , '' Zardari said , referring to militants . `` We have a 700,000 -LRB- person -RRB- army -- how could they take over ? '' For the last two weeks , Pakistani troops have been battling Taliban fighters in Buner and Lower Dir , two districts bordering the Swat Valley -- a broad Taliban stronghold in Pakistan . Army generals claim to have killed scores of militants . Pakistan 's government recently signed a deal that would