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Finland is preparing to join NATO in response to the war in Ukraine - a move which would've been unthinkable just a few months ago.
A statement from Finland's leaders say it must apply for NATO membership - without delay - and calls for rapid action within the next few days.
Sweden is likely to take the same step. NATO chief Jens Stoltenberg says Finland would be "warmly welcomed" into the alliance.
Brussels correspondent Rosie Birchard spoke to Corin Dann.