Japan’s defense ministry also scrambled fighter jets to intercept the warplanes.
Beijing later Tuesday confirmed it had organized drills with Russia’s military according to “annual cooperation plans”.
Moscow also described it as a routine exercise, saying it lasted eight hours and that some foreign fighter jets followed the Russian and Chinese aircraft.
Since 2019 China and Russia have regularly flown military aircraft into South Korea’s air defense zone without prior notice, citing joint exercises.
In November last year Seoul scrambled jets as five Chinese and six Russian military planes flew through its air defense zone.
Similar incidents occurred in June and December 2023, and in May and November 2022.
Meanwhile Tokyo said Monday it had scrambled jets in response to repeated takeoff and landing exercises involving fighter jets and military helicopters from China’s Liaoning aircraft carrier as it cruised in international waters near Japan.
It also summoned Beijing’s ambassador after military aircraft from the Liaoning locked radar onto Japanese jets, the latest incident in the row ignited by Takaichi’s comments backing Taiwan.
Takaichi suggested last month that Japan would intervene militarily in any Chinese attack on the self-ruled island, which Beijing claims as its own and has not ruled out seizing by force.
