border disputes border disputes

Japanese Coast Guard vessels sail alongside Japanese activists' fishing boat, not in photo, warning the activists away from a group of disputed islands called Diaoyu by China and Senkaku by Japan. Emily Wang/AP hide caption

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Emily Wang/AP

Jet diplomacy: A B-52. According to reports, two flew through an area that China now claims is within its air defense zone. Andy Rain /EPA/Landov hide caption

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Andy Rain /EPA/Landov