The Taliban's Atomic Threat - John R. Bolton, Wall Street Journal opinion. At his press conference Wednesday evening, President Barack Obama endorsed Pakistan's official position that it has secure control over its nuclear-weapons arsenal. Mr. Obama said he was "gravely concerned" about the situation there, but "confident that the nuclear arsenal will remain out of militant hands." His words are not reassuring in light of the Taliban's military and political gains throughout Pakistan. Our security, and that of friends and allies world-wide, depends critically on preventing more adversaries, especially ones with otherworldly ideologies, from acquiring nuclear weapons. Unless there is swift, decisive action against the Islamic radicals there, Pakistan faces two very worrisome scenarios. One scenario is that instability continues to grow, and that the radicals disrupt both Pakistan's weak democratic institutions and the military.