Finland officially became the 31st member of NATO in April 2023 – having abandoned its historic neutrality in the wake of the Russian invasion of Ukraine, in what was among the fastest accession processes in the Western military alliance’s history. Now it is already willing to host allied nukes on its territory, making it a target of Russian retaliation. Moscow has long warned against such an ultra-provocative move. The Kremlin said Monday that this requires a response – given also the fact that Russia and Finland share an over 800-mile long border, which is made up largely of Arctic frontier.

https://www.zerohedge.com/geopolitical/russia-closes-border-crossings-several-nato-states-after-finland-lifts-ban-nuclear