Iran's elite Revolutionary Guards began a second day of military exercises in the Persian Gulf Friday to show their readiness to contest any attack by the United States or Israel. <br/><br/>Analysts, however, say the maneuvers are also sending a strong message to Arab nations, which already believe Tehran has plans to extend its power in the region.<br/>The Arab countries are strong trading partners with Iran, but they are also staunch allies of the United States, which is calling for more international sanctions to halt Iranian nuclear activities.<br/>