ISLAMABAD — The Pakistani government Saturday accused the U.S. of sabotaging peace talks with domestic Taliban fighters by killing their leader in a drone strike, as the militants began the process of choosing a successor. The rise in tension, even though the U.S. took out Pakistan’s No. 1 enemy, shows just how complicated the relationship between the professed allies can be. The two repeatedly have clashed over issues such as drone strikes and Pakistan’s alleged support for militants fighting U.S. troops in neighboring Afghanistan. The Pakistani Taliban leader slain Friday, Hakimullah Mehsud, was a ruthless figure known for a deadly attack on a CIA base in Afghanistan and a bloody campaign…