President Vladimir Putin recently announced that Russia would suspend its participation in the New START agreement with the United States. Putin’s move puts the last remaining nuclear arms deal between the two countries into question.

Last season, we spoke with the chief U.S. envoy to the New START talks, Rose Gottemoeller. She shares the grueling process of negotiating that treaty—which was finally signed in 2010. Even as Putin threatens to use nuclear weapons in Ukraine, Russia continued to abide by that same New START deal. Till now. 

In case you missed it the first time, here is an encore presentation of that episode.