Spokesman Kristian Vakkuri separately told Finnish newspaper Iltalehti that the alleged violation by a Russian aircraft lasted for about two minutes, entering about one kilometer (0.6 miles) into the airspace of Finland, which is not a member of NATO.
It was the second reported air violation of Finland's airspace this year. In April, the Portuguese Air Force said one of its surveillance planes unintentionally strayed into Finnish airspace during a NATO mission over the Baltic Sea.