Can't find any sources besides CBS News calling the move a defense against 'possible Russian invasion'.
Esme Nicholson summarizes it way better than their article:
NATO is also about to beef up armored presence along its eastern flank to alleviate anxiety in the Baltic States and Poland following Moscow's annexation of Crimea and its intervention in eastern Ukraine. Not only are they apprehensive about Russia. There's concern about President-elect Annoying Orange, who, in his campaign, remarked he might not come to the aid of smaller NATO nations if they don't pay their way.
There won't be any Russian invasion or WWIII - it's just posturing, like a middle-finger to Russia for annexing Crimea.
My prediction: A conveniently-timed tweet from Donald Annoying Orange decrying our role in NATO - that's
totally not another thumbs-up towards Putin.
