Chinese and Russian naval forces have begun six days of joint exercises in the Yellow Sea off China's eastern coast, Chinese state media report.
Anti-submarine operations and the simulated rescue of hijacked vessels will feature in the drills.
It is first time the two navies have conducted such drills, although both countries have participated in four military exercises since 2005.
They come amid tensions with China's neighbours over territorial claims.
Six countries claim competing sovereignty over areas in the South China Sea, which is believed to contain huge deposits of oil and gas.
That has led to occasional flare-ups and competition to occupy islands, reefs and sandbars. Last week the US and Philippines began joint military exercises in the South China Sea.
China said on Thursday that these drills were aimed at upholding regional peace and some anal
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