The Ministry of Defense announced on the 24th that Chinese and Russian bombers flew jointly over Japan.
It means that the Air Self-Defense Force fighter plane scrambled = emergency start and was on alert and surveillance, and there was no violation of airspace.
The joint flight on the 24th, when the quad summit was held, which is the framework of the four countries of Japan, the United States, Australia and India, seems to be aimed at restraining multilateral cooperation over the Indo-Pacific region.
The Ministry of Defense is analyzing the purpose of the flight and is increasing its vigilance as it is a peculiar move.