2021028 Pratas Island Xi Biden

Xi Jinping and Joe Biden are already at odds over Taiwan, with China showing its ability to cut off one of Taiwan's far-flung islands. (Source photos by AP, Reuters and Kyodo) 

Analysis: China tests Biden on Taiwan, with eye on another island

South China Sea's Pratas becomes latest front in the Beijing-Washington battle

Katsuji Nakazawa is a Tokyo-based senior staff writer and editorial writer at Nikkei. He spent seven years in China as a correspondent and later as China bureau chief. He is the 2014 recipient of the Vaughn-Ueda International Journalist prize for international reporting.

TOKYO -- On Monday evening, as Chinese people were looking at their smartphones, watching their leader Xi Jinping talk about the importance of global cooperation at an online conference hosted by the World Economic Forum, alerts flashed across many screens.

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