CIA Director John Brennan participates in a session at the third annual Intelligence and National Security Summit in Washington, D.C., on Sept. 8, 2016. WASHINGTON -- CIA Director John Brennan warned on Sunday that Russia has "exceptionally capable and sophisticated" computer capabilities and that the U.S. must be on guard. "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 a cyber realm, as well as what they might want to do with it," he told CBS' "Face the Nation" on the 15th anniversary of the Sept. 11 attacks. On the terrorism threat, Brennan said the U.S. government is much better now at sharing information. He praised Saudi Arabia as "a good example of how foreign intelligence services can work against these terrorist organizations."