Sanna Marin's resignation shakes up Finnish politics.

Russia has downplayed Finland's admission to NATO, but its military moves suggest growing concern about the alliance gaining new territory nearby. Moscow has announced plans to increase the size of its military, beef up its forces in northwestern Russia, and reestablish the Leningrad Military District. Russia has long experience in Arctic operations and had developed specialized units and equipment for operations near Finland. However, Russian units trained for Arctic ice are being chewed up in Ukrainian mud.