Watch Senator John Kerry (D-MA) discuss climate change as a U.S. national security threat and the opportunity for the United States to pursue global leadership on the issue.

RICHARD SALOMON:  Good afternoon.  Can I get your attention, please?  It's a pleasure for me to welcome Senator Kerry and all of you to today's program at the Council on Foreign Relations.Before I i…

John E. Herbst, director of the Atlantic Council’s Dinu Patriciu Eurasia Center and former  U.S. Ambassador to Ukraine, and Matthew Rojansky, director of the Kennan Institute at the Woodrow Wilson In…

John E. Herbst, director of the Atlantic Council's Dinu Patriciu Eurasia Center and former U.S. ambassador to Ukraine, and Matthew Rojansky, director of the Kennan Institute at the Woodrow Wilson Int…

Watch Matthew Brzezinski, an author and former Wall Street Journal Moscow correspondent, and Roger D. Lanius, a space historian at the Smithsonian Institute, discuss the legacy of Sputnik fifty years…