Finland and Sweden submitted letters Wednesday formally applying to join NATO, a historic moment for two countries that held fast to military nonalignment until Russia’s invasion of Ukraine upended their thinking about security.
The delivery of the letters to the alliance’s Brussels headquarters marks the start of an accession process that could take months but is expected to result in an expansion of NATO from 30 to 32 members, remaking Europe’s post-Cold War security architecture.
“I warmly welcome the requests by Finland and Sweden to join NATO,” Secretary General Jens Stoltenberg said at a news conference in Brussels with ambassadors from each country. “You are our closest partners, and your membership in NATO would increase our shared security.”
Stoltenberg called the applications a “historic step” and said allies will now consider next steps.
How Putin’s brutal war in Ukraine pushed Finland toward NATO
Swedish Prime Minister Magdalena Andersson and Finnish President Sauli Niinisto of Finland are scheduled to appear Thursday at the White House, where President Biden is expected to show his support.
NATO officials and several allies have signaled that Finland and Sweden could expect protection in the period before their membership is fully ratified and they are part of NATO’s collective defense pact, known as Article 5.
A big question is whether Russian President Vladimir Putin will retaliate. European officials and diplomats said Finland and Sweden are prepared for hybrid or clandestine attacks.
Putin cited the threat of NATO expansion among the rationales for his unprovoked invasion of Ukraine. Kyiv is not on track for NATO membership, but Putin’s war has resulted in a reinvigorated alliance that is now poised to double its land border with Russia.
The two new members would bring NATO’s full force to the far north and bolster its presence in the Baltic Sea region. The alliance would gain two sophisticated militaries with deep experience operating near Russia’s frontier. Sweden also holds the strategically important island of Gotland, just 200 miles from the Russian military in Kaliningrad.
Finland and Sweden didn’t consider themselves neutral before now. Militarily, they have been close NATO partners. Politically, they are members of the European Union.