CIA director warns of 'sophisticated' Russian hacking capabilities
© Moriah Ratner

The U.S. should be wary of Russia's hacking capabilities, CIA Director John Brennan said Sunday. 

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"I think that we have to be very, very wary of what the Russians might be trying to do in terms of collecting information in that cyber realm as well as what they might want to do with it," Brennan said Sunday on CBS's "Face the Nation." 

He said Russia has "exceptionally capable" and "sophisticated" cyber capabilities.

"We've known this for quite a while. Their intelligence services are quite active around the world," he said.

"And this is something that we have to make sure that we're on guard for, not just for our national security purposes but also for making sure that our system of government here is going to be preserved."

Brennan's comments follow the hacking of the Democratic National Committee. Many U.S. security experts attribute the hacking to Russia.