By Dmitry Solovyov MOSCOW (Reuters) - Russia's strategic bombers have resumed their Cold War practice of flying long-haul missions to areas patrolled by NATO and the United States, top generals said on Thursday. ADVERTISEMENT A Russian bomber flew over a U.S. military base on the Pacific island of Guam on Wednesday and "exchanged smiles" with U.S. pilots who had scrambled to track it, said Major-General Pavel Androsov, head of long-range aviation in the Russian air force. "It has always been the tradition of our long-range aviation to fly far into the ocean, to meet (U.S.) aircraft carriers and greet (U.S....