Russia has been accused of interfering with the global GPS navigation system during a major Nordic war game in Finland. European aviation authorities have said signals, heavily used by commercial aircraft, have been affected from Finland, through the Mediterranean and even as far as Iraq. Disruptions to Global Navigation Satellite Systems (GNSS), which include GPS, are caused by the 'jamming' or 'spoofing' of satellite signals. Since the war erupted on February 24, 'jamming and/or possible spoofing has intensified in geographical areas surrounding the conflict zone and other areas,' the European Aviation Safety Agency (EASA) said in an online bulletin Thursday.