The Pentagon today notified Congress that the State Department has approved a potential $2.1 billion sale to Japan of two Aegis Weapon Systems, a key development in Tokyo's plans to expand its land-based ballistic missile defense shield to defend the entire Pacific nation against North Korean threats by building a pair of Aegis Ashore systems. On Jan. 29, the Defense Security Cooperation Agency, which handles government-to-government sales of military equipment for the Pentagon, announced the possible sale of two Aegis...