WASHINGTON - The Bush administration has banned arms sales to Venezuela -- which has been on a buying spree to prepare for an alleged U.S. invasion -- accusing President Hugo Chávez of failing to cooperate in the war on terrorism and maintaining close ties to Cuba and Iran. The decision announced Monday may be largely symbolic because Chávez has been buying the bulk of his weapons, including attack and transport helicopters, patrol boats and military transport airplanes, from Russia and Spain. The first batch of 33 Russian helicopters arrived in Venezuela last month, and 33,000 of the 100,000 Russian Kalashnikov...