TOKYO, May 18, Kyodo - The United States is concerned about possible leaks of U.S. information to Russia through Masaru Sato, a Russian affairs expert at the Foreign Ministry arrested Tuesday, diplomatic sources said Saturday. The U.S. government has strong concerns because Sato allegedly delivered top-secret official telegrams regularly to scandal-tainted lawmaker Muneo Suzuki even after he left a key government post, the sources said. Sato was in a position to see a broad range of information from Japanese diplomatic missions abroad since July 1998 when he assumed a post at the Intelligence and Analysis Bureau, taking charge of top-secret...