A Russian, nuclear-powered attack sub patrolled the waters of the Gulf of Mexico, off the U.S. coast, undetected for a month, a new startling report from the Washington Free Beacon says. The sub, the Free Beacon says, is an Akula vessel loaded with cruise missiles and is one of the quietest in the Russian fleet. From the report: The stealth underwater incursion in the Gulf took place at the same time Russian strategic bombers made incursions into restricted U.S. airspace near Alaska and California in June and July, and highlights a growing military assertiveness by Moscow. The submarine patrol also...