A Russian army helicopter violated Finland's airspace on Wednesday, the Finnish defense ministry said, as the country mulls an increasingly likely NATO membership bid.
"The aircraft type is a Mi-17 helicopter and the depth of the suspected violation is about four to five kilometers", a ministry spokesman told AFP.
This is the second Russian airspace violation this year, following a previous one in April, both of them coming in the wake of the war in Ukraine.
A civilian transport plane belonging to the Russian army briefly entered Finnish airspace on April 8.
Experts have warned that Finland and Sweden would likely be subjected to Russian acts of interference as they consider whether to join NATO as a deterrent against aggression from their eastern neighbor.
Four Russian fighter jets violated Swedish airspace in early March near Sweden's strategically-located island of Gotland in the Baltic Sea.
And on Friday, a Russian spy plane also crossed the Swedish border near a naval base in the south of the country.
Hostile acts such as cyberattacks are also considered likely, according to analysts, although they said that the risk of a military attack was low.
A large majority of Finnish MPs and the public are in favor of joining the Atlantic Alliance, and Finnish President Sauli Niinsto is to announce his personal stance on the issue on May 12.
Finnish Prime Minister Sanna Marin said Wednesday her government's decision would be made "quite soon," and could come within days according to Finnish media.
Finland was ruled by Russia for 108 years before declaring independence in 1917.
It fought off a Soviet invasion during World War II before a peace deal saw it cede several border areas to Moscow.
The Nordic nation remained neutral during the Cold War in exchange for Soviet guarantees not to invade.
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