Henry Kissinger: “International talks with Iran started as an effort to deny Iran the capability to develop a military nuclear option.”

Russia is in my view not a strong country. Russia is a weak country with a large military establishment and a very determined leader.

This deal will reinforce, not resolve the world's challenges in that region.

I believe it likely that the leadership realizes that it is very difficult, if not impossible, for them to carry out the domestic changes in an atmosphere of Cold War with the United States.

We have successfully defeated the Islamic State in Iraq and Syria (ISIS), but the question now is the succession, what happens next.