The FSB report says that Tatsunori's espionage operation has been stopped in Primorsky Krai.
According to the intelligence service, the Japanese diplomat was caught red-handed when he tried to obtain limited information about current aspects of Russia's cooperation with one of the countries of the Asia-Pacific region for a monetary reward.
He also intended to obtain data on the impact of Western sanctions on the economic situation in Primorye.
“Motoki Tatsunori has been declared persona non grata in connection with activities incompatible with the status of a diplomat,” the FSB said.
Russia protested Tokyo through diplomatic channels.