UPDATE - Finland officially joins NATO as 31st member

ADDS QUOTES BY FINNISH PRESIDENT, NATO CHIEF

BRUSSELS (AA) — Finland officially joined NATO on Tuesday as Foreign Minister Pekka Haavisto handed the signed accession treaty to US Secretary of State Antony Blinken.

"With the receipt of this instrument of accession, we can declare now that Finland is the 31st member of the North Atlantic Treaty," Blinken said at the official ceremony in Brussels.

Blinken also confirmed that he received Türkiye's accession protocol for Finland as the latest act of the membership process.

“Finland brings substantial and highly capable forces, expertise on national resilience, and years of experience working side by side with the allies,” NATO chief Jens Stoltenberg said at a joint news conference with Finnish President Sauli Niinisto after the ceremony.

“Finland now has the strongest friends and allies in the world,” he further said, adding that he is “deeply proud” to welcome the country as a new NATO member.

He said Russian President Vladimir Putin “wanted to slam NATO's door shut, but today we show the world that he failed.”

“Aggression and intimidation do not work,” he said.

For his part, Niinisto called his country’s NATO accession a “great day for Finland,” stressing the importance of “security and stability” that the membership will bring to his country.

Both Stoltenberg and Niinisto expressed hope that Sweden, which applied together with Finland, will soon become the 32nd member.

Finland's national flag will be raised at NATO headquarters later on Tuesday.

After the Russia-Ukraine war began in February last year, Finland decided to abandon its decades-long neutrality and applied for NATO membership.

With Finland's accession, the length of NATO's border with Russia nearly doubled.