A right-wing activist has been arrested in a hotel where the Russian national team are booked to stay.
The 62-year-old man, whose name has not been released, was protesting against Russia's occupation of the Japanese-claimed southern Kuril islands since the end of World War Two.
The man - who is the leader of a political organisation - was arrested on suspicion of trespassing and intimidation.
A police statement said that the man shouted: "How outrageous that you let Russians stay while they refused to return the Northern Territories (southern Kurils).
"We will surround your hotel with propaganda trucks if Russians are allowed to stay without a reason."
Police have declined to name the hotel but the incident is the second scare concerning the Russian team this month.
On 6 May a training pitch reserved for the Russian team was found discoloured by insecticide.
Police have yet to find the people responsible or a motive.