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Finland has become the 31st member of the Nato. Its membership of the security alliance means Nato's border with Russia has almost doubled. Finland's accession is a setback for Russia's Vladimir Putin, who had repeatedly complained of Nato's expansion before his full-scale invasion of Ukraine. Finland's Defence Minister, Antti Kaikkonen, says joining Nato will make Finland even more safe, and "was good for Finland and good for Nato".

(Photo: Finland's Foreign Affairs Minister (L) shakes hands with the US Secretary of State (R) at the official joining ceremony at Nato's headquarters in Brussels. Credit: Getty Images.)