With thousands of Russian troops already on the ground in Ukraine, President Obama says Putin's country is "on the wrong side of history."
And today, he warned there will be consequences for breaking international law, saying that the U.S. is "examining a whole series of steps" to respond economically and diplomatically to Russia's actions.
But what exactly are those steps? Here to discuss are General Wesley Clark, former NATO Supreme Allied Commander, and Michael McFaul, the former U.S. Ambassador to Russia.
Vladamir Putin is beating the war drum.
Less than a week after the Olympic games, the Russian president is mobilizing his forces and preparing to crack down on the former Soviet State of Ukraine.
Russian fighter jets were dispatched to patrol the country's borders Thursday, and nearly 150,000 troops have been mobilized into military exercises near the region.
Russia says it will respect the "territorial integrity of Ukraine," but there is no question the show of force is a clear message to the U.S. it has no intention of letting Ukraine go.
CNN's Erin Burnett asked former NSA and CIA director General Michael Hayden what this means to the U.S. and Russia.
Russian president Vladimir Putin "is going to play hard ball over a long period of time because a Ukraine outside of his orbit and firmly in the western camp is probably unacceptable to him," Hayden said.
A report on NSA tactics commissioned by President Obama himself recommends changes to some, but not all, of the agency's controversial spying tactics. But will the changes do anything to regain the public's trust, or has the political damage already been done?
Democratic strategist Maria Cardona and former spokesman for Speaker John Boehner Terry Holt are OutFront to discuss the implications.
Changes may be coming to the NSA's controversial surveillance programs.
An outside panel, requested by President Obama, suggests ending the government's mass storage of Americans' phone records.
But the panel doesn't recommend ending the controversial tactics altogether.
CNN's Chief National Security Correspondent Jim Sciutto is OutFront with the details.
A federal judge has ruled the National Security Agency's bulk collection of millions of American's phone records is likely unconstitutional.
The data-mining program was revealed by NSA Leaker Edward Snowden.
Snowden issued a statement in response to the ruling, saying "Today, a secret program authorized by a secret court was, when exposed to the light of day, found to violate American's rights. It is the first of many."
But a Justice Department spokesman says "... we believe the program is constitutional as previous judges have found."
They say, the ruling is being studied.
CNN's Senior Legal Analyst Jeffrey Toobin is OutFront.