In April, President Obama and Russian President Dmitry Medvedev signed the New START Treaty, the biggest nuclear arms pact in a generation. But the treaty faces significant Republican opposition as it enters the Senate for a final vote. How would a blocked treaty affect our arms policy and our relationship with Russia?

The nuclear abolition documentary Countdown to Zero is not just a howl of alarm or a historical primer. It's a shocking but completely reliable account of the issue of nuclear weapons as it exists today.

To discuss the threat of nuclear war, Jonathan Schell, Nation Institute fellow and author of "Reaching Zero," guests on the Brian Lehrer Show with David Hoffman, Foreign Policy contributing editor.

Gary Wills's Bomb Power: The Modern Presidency and the National Security State; Elizabeth Arnold's Effacement.

As the nuclear security summit convenes in Washington, the US's "first-use" of nuclear bombs in 1945 still matters.

Tom Engelhardt and Jonathan Schell discuss American involvement in Vietnam and Afghanistan, US nuclear policy from the 1960s to the present and the dilemma of nuclear weaponry in the Obama era.

The nuclear dilemma in the Obama era.

Why the Obama administration's efforts to achieve a Middle East peace between the Israelis and Palestinians are inextricably linked to its efforts to bring Iran to heel.

At the UN this week, Barack Obama told the world to stop complaining about US hegemony and start working with Washington on big global problems. He should take his own advice.

The official secrecy and deceptions about our nuclear weapons posture and policies and their possible consequences have threatened the survival of the human species.