The air patrol was part of an annual cooperation plan between the countries.
hinese and Russian militaries have organised and carried out the ninth joint strategic air patrol in "relevant airspace" over the Sea of Japan on Friday, Chinese state broadcaster CCTV said.
The air patrol was part of an annual cooperation plan between the countries.
In July, both militaries conducted a joint air patrol using nuclear-capable strategic bombers near the US state of Alaska in the North Pacific and Arctic, prompting the United States and Canada to scramble fighter jets.
Also on Friday, Taiwan said it had detected 41 Chinese military aircraft and ships around the island ahead of a Hawaii stopover by President Lai Ching-te, part of a Pacific tour that has sparked fury in Beijing.
The figure was the highest in more than three weeks, according to an AFP tally of figures released daily by Taiwan's defence ministry.
China insists self-ruled Taiwan is part of its territory, which Taipei rejects.
To press its claims, China deploys fighter jets, drones and warships around Taiwan on a near-daily basis, with the number of sorties increasing in recent years.
In the 24 hours to 6:00 am on Friday (2200 GMT Thursday), Taiwan's defence ministry said it had detected 33 Chinese aircraft and eight navy vessels in its airspace and waters.
That included 19 aircraft that took part in China's "joint combat readiness patrol" on Thursday evening and was the highest number since November 4.
Taiwan also spotted a balloon -- the fourth since Sunday -- about 172 kilometres (107 miles) west of the island.
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