| 摘 要： | On 27 October 2015, the US guided-missile destroyer USS Lassen entered China's 12-nautical-mile territorial waters in the South ChinaSea to carry out a so-called freedom of navigation (FON) operation.The FON issue has driven tensions in the region and has become a sore point in Sino-US relations.The US has long implemented close-in reconnaissance near Chinese territorial waters under the FON banner, but in recent years,the US has used this as an instrument to interfere in East Asian maritime disputes, risking heightening Sino-US frictions.As a result, their strategic mutual suspicion has increased significantly.This paper attempts to review the evolution of the FON issue in Sino-US relations, analyze the causes of Sino-US differences and the impacts, and assess future prospects on this issue.
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