China's Ministry of Defence spokesman Colonel Yang Yujun said the ministry had complained to the US Embassy's military attache. Photo: Reuters
US backs Japan as tensions soar on Beijing's air defence zone over East China Sea
Beijing defence strategy is criticised by Japanese leader and ignites diplomatic tension across region
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Diaoyu Islands
China's Ministry of Defence spokesman Colonel Yang Yujun said the ministry had complained to the US Embassy's military attache. Photo: Reuters