It is just of no use to warn China like this. China will continue on building the islands and U.S. won't be able to stop it unless U.S. declare war on China.
What a translation! Obama did say that Chinese claim maybe "legitimate."
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奥巴马用一个拳击上的比方说:“有可能他们宣称的一些部分是合法的,但他们不能仅仅试图通过肘击和推人让其成立。”