The Nuclear Non-Proliferation Treaty is the most important and impactful global agreement on nuclear weapons. 191 counties have joined the NPT since it entered into force in 1970, with just a few notable exceptions, including India, Pakistan, Israel and South Sudan. The NPT has three essential pillars: countries that do not have nuclear weapons cannot acquire them; countries that do have nuclear weapons need to work towards disarmament; and countries should have the ability to access civilian nuclear technologies, under proper safeguards.

Every five years, the parties to the NPT come together for what is known as a Review Conference in which they assess progress towards these three pillars and discuss ways to enhance the treaty. The NPT RevCon, as it's known, is one the major multilateral conference on nuclear security, and it is taking place at UN from April 27 to May 22.

Joining me to discuss the significance of this NPT Review Conference is Kelsey Davenport, Director for Nonproliferation Policy at the Arms Control Association. We kick off with a discussion of the NPT itself, and it's impact over the decades and then have a long conversation about the key storylines, diplomatic intrigues and key policy debates that will unfold over the next three weeks at the UN. Consider this episode your curtain-raiser for the most important global gathering on nuclear security of the half-decade.

A few notes. This episode is produced in partnership with Ploughshares, a foundation committed to reducing and ultimately eliminating nuclear threats. I'll have a follow up episode at the end of conference that discusses what exactly happened during the NPT RevCon. Also, I'll be attending much of the RevCon in person. I'll be serving as something akin to a "pool reporter," covering this conference in support of dozens of international journalists who report on nuclear security issues and feeding them news and insights from the confab. This project is backed by the Stanley Center for Peace and Security Developing Story Project, an initiative to support, strengthen, and sustain reporting on nuclear weapons and related issues. I'm looking forward to this. If you are around the UN, say hi.