Chinese warplanes buzzed a Canadian helicopter over international waters in the South China Sea last weekend and then fired flares at it, Defence Minister Bill Blair said on Friday, saying the incidents had put the crew in danger. His comments marked the second time in two weeks that Canada has accused China's air force of unsafe behavior. In mid-October, Blair said a Chinese jet had come within five meters (16 feet) of a surveillance plane taking part in a U.N. operation to enforce sanctions ag