Russia has denied suggestions that it was responsible for Finland having its GPS signal disrupted during NATO war games.
Finnish Prime Minister Juha Sipila revealed on Sunday that air navigation services across the country had to issue traffic warnings due to the interruption last week, which is believed to have been deliberate.
Norway posted a similar warning about the loss of GPS signals for pilots in its own airspace at the end of October, when the NATO exercise off its Trondheim coast got under way.
Mr Silipa appeared to point the finger at the Russians during an interview with Finnish public broadcaster Yle, noting that the Kremlin "is known to possess such capabilities".
The Kremlin has developed a strong CEMA (cyber and electromagnetic activity) military capability which NATO has been focusing on counteracting in recent years.
Russia has said it has "no information" about the allegation, which has not been made by any of the other 31 countries that had forces taking part in the war games – military exercises used to test tactics and equipment.
The so-called Trident Juncture was the largest NATO exercise in decades and came to a close last Wednesday, with some non-member nations – including Finland – joining in as allies.
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It took place close to Russia in an area stretching from the Baltic Sea to Iceland.
Finland has a testing history with Russia, with which it shares an 833-mile (1,340 km) border, and part of the reason why it has not signed up to NATO is to avoid any potential confrontation with its eastern neighbour.