NATIONAL HARBOR - A US Air Force general on Monday cited what he called "alarming" moves by the Russian military to beef up its air forces in the years since the invasion of Georgia in 2008 and to establish firm defenses around areas like Crimea.General Frank Gorenc, commander of US Air Forces in Europe, told reporters he was concerned about Russia's moves to increase the quantity and quality of its aircraft and field unmanned aircraft."The advantage that we had from the air, I can honestly say, is shrinking," Gorenc said at the annual Air Force Association conference.Gorenc called "alarming" both Russia's investments in modernizing its air force and in building formidable surface-to-air missile defenses. Two examples of the latter are defenses set up around the Crimea region of Ukraine, which Russia annexed in 2014, and Kaliningrad, a Russia enclave between Poland and Lithuania.US officials often warn of strides by China in developing defenses against US stealth fighters and bombers and more capable surface-to-air missiles, but Gorenc said Russia was making similar moves."This is not just a Pacific problem; it is as significant in Europe as it is anywhere else on the planet," he said. "I don't think it's controversial to say they've closed the gap in capability.