Special report: How far will Putin go?
Amanpour
00:00
What's the Threat Level?
"We need to be very clear with Vladimir Putin that there are consequences for the kind of action he's talking about," Obama says. "An attack on a NATO country is an attack on all of us," President Biden has said, adding: "I don't think at this point it's in Putin's interest or Russia's interest to attack NATO." The U.S. and its allies have been conducting military exercises near Ukraine since last week.
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