The Pentagon is considering expanding current national missile defense policy -- which is focused on threats from North Korea and, should Tehran obtain a long-range nuclear capability, Iran -- to also counter "regional" aggressors, including Russia or China, according to a senior Defense Department official. Laura DeSimone, Missile Defense Agency executive director, said the Pentagon’s policy shop has tasked the agency to consider options for defending against a wider set of nations. “The department has asked us to think about...