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In page History of East Asia:

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They also lost repeatedly against Japan, partly because Britain had helped modernise Japanese forces as a counter to Russian influence in the region.[citation needed] In 1879, Japan annexed the Ryukyu Kingdom, then a Chinese tributary state, and incorporated it as Okinawa prefecture. Despite pleas from a Ryukyuan envoy, China was powerless to send an army. The Chinese sought help from the British, who refused to intervene. In 1895, China lost the Sino-Japanese war and ceded Taiwan, the Penghu islands and the Liaodong peninsula to Japan. In addition, it had to relinquish control of Korea, which had been a tributary state of China for a long time.