MOSCOW (AP) _ A naval officer in Russia's Pacific Fleet who writes for a military newspaper reportedly has been arrested and accused of spying for Japan.

Capt. Grigory Pasko, a correspondent for Boyevaya Vakhta (Combat Vigil), was arrested Sunday in the Far East port of Vladivostok after returning from Japan, the ITAR-Tass and Interfax new agenices reported today.

Russia's Federal Security Service, the primary successor of the KGB, told ITAR-Tass the officer had been charged with high treason.

Pasko was leaving on a private visit to Niigata, Japan, on Thursday when customs agents at Vladivostok airport found he was carrying documents about defense plants in the Primorsky region, ITAR-Tass said.

The documents were confiscated, and the counterintelligence service decided to arrest him on his return after concluding that the data was confidential, the Russian reports said.