 NATO summer takes place in Washington, D.C. this week, and joining us to give perspective is Kurt Volker, former U.S. ambassador to NATO under the George W. Bush and Obama administrations, also served as a U.S. special representative for Ukraine negotiations in the Trump administration. Ambassador Volker, thanks for your time. It's a pleasure. Thank you. How would you describe the purpose of this week's meetings of NATO in Washington, D.C.?