![turkish president tayyip erdogan finland s president sauli niinisto sweden s prime minister magdalena andersson nato secretary general jens stoltenberg turkish foreign minister mevlut cavusoglu sweden s foreign minister ann linde and finnish foreign minister pekka haavisto prepare to sign a document during a nato summit in madrid spain june 28 2022 phhoto reuters turkish president tayyip erdogan finland s president sauli niinisto sweden s prime minister magdalena andersson nato secretary general jens stoltenberg turkish foreign minister mevlut cavusoglu sweden s foreign minister ann linde and finnish foreign minister pekka haavisto prepare to sign a document during a nato summit in madrid spain june 28 2022 phhoto reuters](https://i.tribune.com.pk/media/images/NATO1656445394-0/NATO1656445394-0.png)
Finland's flag will be hoisted outside NATO headquarters on Tuesday when it becomes the newest member of the Western alliance, Secretary General Jens Stoltenberg said.
"Tomorrow we will welcome Finland as the 31st member," Stoltenberg told reporters on the eve of a historic meeting of NATO foreign ministers in Brussels.
Russian President Vladimir Putin's all-out invasion of Ukraine last year upended European security and pushed Finland — and its neighbour Sweden — to drop decades of non-alignment and seek to join NATO's protective umbrella.
Objections from Turkey and Hungary held up Helsinki's bid for months, and are still blocking Stockholm, before the parliament in Ankara cleared the final obstacle for Finland with a vote last week.
Completing the ratification in well under a year still makes this the fastest membership process in the alliance's recent history.
Also read: Turkish parliament ratifies Finland's NATO accession as Sweden kept waiting
Now all that is left are the last highly choreographed formalities at NATO headquarters in Brussels.
Finland's foreign minister will hand over the formal accession papers to US Secretary of State Antony Blinken, the keeper of NATO's founding treaty, and the country's blue-and-white flag will be raised alongside those of its new allies.
Finland's President Sauli Niinisto will speak at the event, Helsinki said.
"President Putin went to war against Ukraine with a clear aim to get less NATO," Stoltenberg said.
"He's getting the exact opposite."
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