North Atlantic Treaty Organization (NATO)

Historian Mary Elise Sarotte tells how NATO expanded into Eastern Europe after the fall of the U.S.S.R, and is now obligated to defend nations near Russia's war in Ukraine. Her book is Not One Inch.

Historian and former State Department official Michael Kimmage says the war in Ukraine is going "surprisingly badly" for the Kremlin: "It didn't get the politics of Ukraine right. It didn't expect the Ukrainians to fight." We talk about possible scenarios of how this conflict could end, and what that means for Ukraine, Europe and the U.S.

Journalist Anne Applebaum has been covering the war in Ukraine for The Atlantic. "I don't think that we will ever again smugly assume that borders in Europe can't be changed by force," she says.

Former Secretary of State Madeleine Albright describes herself as an "optimist who worries a lot." And lately, it seems, there has been much to worry about.

He commanded the NATO troops during the Kosovo conflict, the first and only NATO war. His new memoir is Waging Modern War

Stephen Engelberg of the New York Times. He is a former Eastern Europe correspondent and is presently an investigative reporter in the Washington bureau. Engelberg will reconstruct the story of the turning point in the Bosnian war: how the U.N. and Nato decided to bomb Serb headquarters last May, and then stop after the Serbs took peace keepers hostage.

Journalist Misha Glenny. Glenny has been covering the war in former Yugoslavia--first as correspondent for the BBC and now as an independent journalist. He is the author of the book "The Fall of Yugoslavia." He will talk about the recent mortar attack on the market in Sarajevo and the effects of the recent downing by NATO forces of four Serbian warplanes.

British Journalist Timothy Garton Ash. George Kennan has compared Garton Ash's powers of political observation to those of de Toqueville's. ASH's beat is Eastern Europe, and he has been on hand to chronicle the popular disavowal of Communism there (Garton Ash's classic account of the Prague Uprising in 1986 is "The Magic Lantern"). His most recent book concerns the German Re-Unification, and what Germany's role will be in the new Europe: "In Europe's Name: Germany & the Divided Continent" (Random House).

Journalist Stan Sesser is a reporter covering Southeast Asia for the New Yorker. He has collected some of those pieces in a new book "The Lands of Charm and Cruelty: Travels in Southeast Asia." He discusses the recent elections in Cambodia which featured violence, twenty political parties and massive voter turnout