The Taliban insurgency and the war in neighbouring Afghanistan have put Pakistan's nuclear arsenal at risk giving rise to a troubling situation. An arms control expert, Stephen Hadley, who served as former US President George W Bush's national security adviser says, the situation in Pakistan is troubling from a lot of perspectives.<br/>Stephen Hadley, who now advises Washington-based think-tank the US Institute of Peace said that there is a lot of concern about what happens to Pakistan's nuclear weapons if the government fragments in some way.<br/><br/>Speaking at an international security conference in Halifax, he said there is concern in the Bush administration after the September, 2001 terrorist attack that US-led military action inside Afghanistan might destabilise Pakistan and could even lead to a Taliban government. He said the US has assisted Pakistan since 9/11 in maintaining legitimate command and control efforts over its arsenal.<br/><br/> <br/>