ALEXANDRIA, Va. - A former top-level State Department official illegally took a secret, unauthorized trip to Taiwan last year and met with Taiwanese intelligence officers, according to a criminal complaint. Donald W. Keyser, a 30-year veteran at the State Department, was charged Wednesday with deliberately concealing from his superiors that he took a four-day trip to Taiwan last September. Federal law requires an individual with Keyser's security clearances to report all foreign travel. Keyser would not have been permitted to travel to Taiwan on official business because the United States and Taiwan do not have formal diplomatic relations, according to...