
Thomas Countryman
Former U.S. diplomat and acting Undersecretary of State for Arms Control and International Security, now board chair of the Arms Control Association and an expert on nuclear arms control.
Best podcasts with Thomas Countryman
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Feb 5, 2026 • 20min
The last US-Russia nuclear treaty just expired
Matt Korda, a nuclear-arms tracker at the Federation of American Scientists, and Thomas Countryman, a former U.S. arms control diplomat, discuss the lapse of the last US-Russia treaty. They cover START history and how limits cut arsenals, escalating risks today, China’s role in talks, verification and short-term measures, and how more nuclear actors and politics raise accident and escalation dangers.


