By Kanishka Singh, Asif Shahzad and Ariba Shahid WASHINGTON/ISLAMABAD (Reuters) -The U.S. and Pakistan have struck a deal that will result in lower tariffs for the South Asian nation as well as an agreement in which Washington will help develop Islamabad's oil reserves,

Pakistan’s proven recoverable conventional crude oil reserves of between 234 million and 353 million barrels puts it at the 50th position globally; experts spot US attempt at stirring South Asian political cauldron.