Zhè chǎng tánpàn yǐjīng biànchéng le yī chǎng chíjiǔzhàn.
These negotiations have already turned into a war of attrition.
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history
持久战 is most famous from Mao Zedong's 1938 essay 「论持久战」 (On Protracted War), in which he argued that China's strategy against Japan should be a prolonged war of attrition rather than seeking a decisive early battle.