The U.S. cannot go it alone simply when it is convenient.

Iran's arms exports to the murderous Assad regime in Syria are of particular concern. As the Panel of Experts has concluded, Syria is now the central party to illicit Iranian arms transfers.

The Russians are clearly already engaged in a proxy war against the government of Ukraine. And that is something that we and the rest of the world have actively condemned and sanctioned Russia already heavily for, particularly the United States, as we have imposed now meaningful, tough sanctions in critical sectors, including the defense sector, the financial sector, and the energy sector.

I am straight forward; I am not manipulative; I am not two-faced. And I think that that has served me well in all of my roles, particularly as a diplomat, because people knew if I said something, I meant it. If I said no, I meant no, and if I said we could make this work, we would make it work.

I'm apologetic when I feel like I've made a mistake. And when I have done a disservice to myself or someone else. But I don't feel a need to apologize for doing or saying something that I think needs to be said, just because it may not sit comfortably with somebody else.

One of the things I love about negotiations is that you have to be able to play it like an orchestra, different instruments for different circumstances. There's sweetness, and encouragement, and cajoling. There's pressure, there's drama, there's ultimatums.

Iran's economy is now shrinking by 1 percent a year. Its oil production is down 40 percent.