The Finnish flag, consisting of a ‘Sea Blue’ Nordic Cross on a White field, will shortly be raised at Nato Headquarters in Brussels.
Finland applied for NATO membership in May 2022, fearing that they would be the next target after the Russian invasion of Ukraine last year.
Although the first accepted Finnish flag was presented in 1848, the current flag was officially adopted on 29 May 1918.
NATO Secretary General Jens Stoltenberg told reporters it would be “a historic and great day for NATO and for Finland.