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Putin and Xi test a budding military alliance in the Pacific -- and step up confrontation

Moscow (CNN)Russian President Vladimir Putin and Chinese President Xi Jinping sent a clear message on Tuesday: They are ready to test the limits of their budding military partnership in the Pacific.Here's what we know: Early on Tuesday, both South Korea and Japan scrambled fighters to respond to Russian and Chinese military aircraft flying a joint sortie through a region.Things escalated dramatically. According to South Korea, two Chinese H-6 bombers passed into Seoul's Air Defense Identification Zone, joined by two Russian Tu-95 strategic bombers. South Korea's Joint Chiefs of Staff claimed they fired warning shots at a Russian A-50 command and control military aircraft that twice violated their airspace.Japan's Ministry of Defense backed ...