What do warming relations between Russia and the U.S. mean for Iran? NPR asks Karim Sadjadpour, senior fellow at the Carnegie Endowment for International Peace, about the complexities.

So how might a warming of U.S.-Russian relations affect Tehran? To discuss this, we're joined by Karim Sadjadpour. He is a senior fellow in the Middle East Program at the Carnegie Endowment for ...