HELSINKI: Finland's president and prime minister said on Thursday (May 12) their country must apply to join the NATO military alliance "without delay", a major policy shift triggered by Russia's invasion of Ukraine.
Sweden is also close to a decision on asking to join NATO after decades of following a neutral path.
The announcement is a big setback for Russia, which had partly tried to justify its invasion of Ukraine as a means to protect itself from NATO's eastward expansion.
Finland, which shares a 1,300km border and a difficult past with Russia, has gradually stepped up its cooperation with the North Atlantic Treaty Organization (NATO) as a partner since Russia annexed Crimea in 2014.
But until the Feb 24 invasion of Ukraine - which has seen thousands of people killed, cities razed, and forced millions to flee their homes - the Nordic country had refrained from joining NATO in order to maintain friendly relations with its eastern neighbour.
"Finland must apply for NATO membership without delay," President Sauli Niinisto and Prime Minister Sanna Marin said in a joint statement.
"We hope that the national steps still needed to make this decision will be taken rapidly within the next few days."
NATO allies expect Finland and Sweden to formally apply to join the alliance in the coming days and will grant membership quickly, five diplomats and officials told Reuters ahead of the Finnish announcement.
The Finnish parliament will debate the announcement on Monday. A majority of lawmakers have already signalled their support for membership.
"LOOK AT THE MIRROR"
Ahead of Thursday's announcement, Niinisto had said that Russian President Vladimir Putin was responsible for causing Finland's decision.
"You caused this. Look at the mirror," he said on Wednesday.
Russia has repeatedly warned both countries against joining the alliance. As recently as Mar 12 its foreign ministry said "there will be serious military and political consequences" if they do.
Baltic countries, which were once ruled from Moscow and are now members of NATO, welcomed Finland's announcement.
"Finland decided to join the Alliance. NATO is about to get stronger. Baltics about to get safer," Lithuanian Foreign Minister Gabrielius Landsbergis said.
The Baltics rely on a thin strip of land called the Suwalki corridor to connect by land with the rest of NATO. The head of the Estonian defence forces said Finland joining the alliance, and possibly Sweden, would boost NATO's maritime and air defences.
"The most important addition to our defence plans is awareness of maritime and airspace. We will have a common picture, we will have our warning time reduced," Brigadier General Enno Mots told Reuters on Thursday.
Denmark and Norway, fellow Nordic nations that are NATO members, were quick to welcome Finland's application and said they would push for fast NATO admission.
Ukraine's fate has been particularly disturbing for Finland to watch as it fought two wars with Russia between 1939 and 1944, repelling an attempted invasion but losing around 10 per cent of its territory in the subsequent peace agreement.
The view among Finns on NATO has changed rapidly since Russia initiated what it calls a "special operation" in Ukraine.
Public support for joining NATO has risen to record numbers over recent months, with the latest poll by public broadcaster YLE showing 76 per cent of Finns in favour and only 12 per cent against, while support for membership used to linger at only around 25 per cent for years prior to the war in Ukraine.
While military non-alignment has long satisfied many Finns as a way of staying out of conflicts, Russia's invasion of sovereign Ukraine has led an increasing number of Finns to view friendly relations with Russia as an empty phrase.
Sweden's ruling Social Democrats are expected to decide on Sunday whether to overturn decades of opposition to NATO membership, a move that would almost certainly lead to Sweden also asking to join the 30-nation alliance.
A poll by Demoskop in daily Aftonbladet on Tuesday showed support for NATO membership, which has been rising steadily among Swedes this year, at 61 per cent up 4 percentage points from the end of April. In January, the figure was 42 per cent.