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"What's to stop him? Certainly neither the U.S. nor NATO," one Insider said.
Russian President Vladimir Putin "must be checked before it's too late," one of National Journal 's Security Insiders said.
When it comes to Crimea, experts say Obama can do little to dissuade Russia's leader.
As the U.S. emerges from an era of war, experts say Congress must change the law that authorized it.
"But they won't," one Insider said.
Experts' views appear to contrast with those of American public.
Congress's scramble to undo the $6 billion in military pension cuts is a sign.