I was very happy in my job at the United Nations.

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

What I learned is that policymakers have to force consideration of actions that may not have occurred to them at the time.

The problem is, Hamas is using force to try to extort progress on its political objectives.

The notion that I had become a political lightning rod was painful for me to experience.

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.

President Obama is an extraordinary person to work with and for.