Satellite images show activities by Hanoi on Ladd Reef in the Spratly Islands, which is feared to trigger Beijing's anger.

卫星图片显示，越南正在该群岛的日积礁上活动，此举可能引起中国的不满。

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This is the case with virtually all the islands being disputed on Paracel and Spratly archipelagos.

几乎所有在西沙和南沙有争议的海岛都属于这种情况。

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Now, it is refurbishing a former military airbase on Big Spratly, the largest of the specks it controls, to fly in camera-wielding reinforcements.

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China's claim in the South China Sea is by far the largest, and includes the Spratly and Paracel archipelagos.

BBC: Vietnam accuses China in seas dispute