George stephanopoulos one-on-one with president obama, just as we learn this weekend of that major development, the u.S. And russia reaching a deal on syria. Secretary of state john kerry and russia's... See More
George stephanopoulos one-on-one with president obama, just as we learn this weekend of that major development, the u.S. And russia reaching a deal on syria. Secretary of state john kerry and russia's foreign minister announcing the plan to rid syria of its chemical weapons. The deal says, within a week, syria is to provide an inventory of its chemical weapons and where they are stored. By november, syria must allow international inspectors on the ground. And by the middle of next year, all those chemical weapons must be removed or destroyed. This deal comes just days after president putin blasted president obama in an editorial in "the new york times." Now, the two forming an unlikely alliance and george asked the president, can he really trust putin? Reporter: President putin has become your unlikely partner -- yeah. Reporter: In this. And even in this op-ed, which has stirred up a lot of controversy near in the united states, he said there's every reason to believe that the rebels are the ones who used the chemical weapons. So, does that tell you he's willing to lie to protect assad? Well, nobody around the world takes seriously the idea that the rebels were the perpetrators -- Reporter: He wrote it in "the new york times." Well, I understand. What I said is, nobody around the world takes seriously the idea that the rebels perpetrated this attack. And I talked to mr. Putin a year ago, saying to him, the united states and russia should work together to deal with these chemical weapons stockpiles and to work to try to bring about a political transition inside of syria. Reporter: Do you really trust that he has the same goal? Oh, I don't think mr. Putin has the same values that we do and I think, obviously, by protecting mr. Assad, he has a different attitude about the assad regime. Reporter: He's had some, a lot of armchair criticism, I'm sure you are used to that. I am. Reporter: Senator corker said you're not comfortable as commander in chief, "it's like watching a person who's caged." What do you make of that? I think that folks here in washington like to grade on style. And so, had we rolled out something that was very smooth and disciplined, they would have graded it well even if it was a disastrous policy. We know that, because that's exactly how they graded the iraq war. Reporter: So that doesn't change your view of president bush? No, what it says is that I'm less concerned about style points, I'm much more concerned about getting the policy right.
This transcript has been automatically generated and may not be 100% accurate.