Finland became the 31st member of NATO in a historic expansion of the military alliance in response to Russia’s invasion of Ukraine. The addition of the country is vastly important as it more than doubles the length of the border between the western alliance and Russia.

WSJ’s Sune Engel Rasmussen explains what the Nordic nation’s accession means for the bloc and security in Europe.

0:00 Finland ends its decades-old policy of military non-alignment
0:42 What Finland brings to NATO
1:36 What this NATO expansion means for Russia
2:38 Where does Sweden’s NATO application stand?

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