Pakistan said the United States drone strike that reportedly killed a Taliban leader violated its sovereignty, The Guardian reported . Taliban leader Mullah Akhtar Mansour was killed in an airstrike on Saturday in Pakistan, CNN confirmed , according to sources within al Qaeda and the Taliban. U.S. officials said the drone strike was authorized by President Obama. But Pakistan said Sunday the U.S. government didn't tell Prime Minister Nawaz Sharif of its plans ahead of the strike. “This is a violation of Pakistan’s sovereignty,” Sharif told reporters in London, according to The Guardian. The Guardian reported that the American government...