Japanese defence minister Nobuo Kishi said Chinese and Russian fighter jets carried out joint flights near Japan while leaders of Quad nations met in Tokyo.
He added that the government has "grave concerns" over the flights and spoke to Russia and China regarding the act. Leaders from the US, India, Australia, and Japan met on Tuesday to talk about regional security.
China has repeatedly expressed displeasure over the new alliance between the four nations and alleged that it will create issues in the region. The Quad leaders, in a joint statement, warned of attempts to "change the status quo by force" without naming Russia or China. Quad leaders' joint statement pointed at the war in Ukraine but listed activities China has been accused of carrying out.
According to Kishi, the fighter jets did not breach airspace. Two Chinese bombers and two Russian bombers were seen flying in the Sea of Japan. They made a joint flight to the East China Sea, reported AFP.
After the first flight, two new Chinese bombers replaced the old ones and joined the Russian bombers. They flew from the East China Sea to the Pacific Ocean, said the defence minister to the media.
He added that a Russian intelligence-gathering aircraft also flew off northern Hokkaido to the Noto Peninsula in central Japan. The minister said the move is "provocative" considering the Quad summit was taking place in Tokyo. The Japanese defence ministry had communicated the concerns about the country's and region's security through diplomatic routes.
Minister Kish said China's joint flight and collaboration with Russia amid the international community's response to Russia's aggression against Ukraine is concerning. "It cannot be overlooked". Japan shares borders with both China and Russia and has volatile border disputes with both nations.