A secret US diplomatic cable released by WikiLeaks says that France, not sure about Pakistan's nuclear deterrent, has decided against supplying nuclear energy technology to it.According to a cable dated September 3, 2009 disclosed by whistle-blower website and published in Dawn newspaper, French President Nicolas Sarkozy's Diplomatic Adviser Jean-David Levitte had told US diplomats that the French government was not sure that the Pakistani nuclear deterrent is secure, especially with the frequent movement of nuclear weapons by the Pakistani military.Taliban has stepped-up a violent campaign in Pakistan to avenge Osama bin Laden's killing and has renewed fears that the country's nuclear warheads could be vulnerable.French Defence Minister Gerard Longuet had on Friday, in New Delhi expressed his concerns regarding Pakistan, saying this part of the world needs some clarification and stability as well.