As Warsaw prepares to host the NATO summit, former Polish President Lech Walesa called on the military alliance to show determination in the face of a more aggressive Russia. In an exclusive interview with RFE/RL, the pro-democracy icon who led the battle against communism in Poland said Moscow could not afford a military conflict with the West. Walesa also suggested how the European Union could move forward following the Brexit vote. (Camera: Marek Hajduk. Producer: Stuart Greer)