TheHill:

Russia has upped its saber rattling in Eastern Europe and the Arctic, a move that has put the Biden administration on alert.

In the past two weeks, Moscow has moved to test Washington and its allies on land, in the air and at sea with a buildup of military equipment in eastern Ukraine, military flights near Alaskan airspace and submarine activity in the Arctic.

“I think we’ve been very clear about the threats that we see from Russia across domains. … We’re taking them very, very seriously,” Pentagon press secretary John Kirby said Wednesday.

The Defense Department is particularly observant of Russian activity after fighting resumed between Moscow-backed separatists and Ukrainian soldiers in eastern Ukraine, ending a cease-fire the two groups made last summer…

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