Nuclear negotiations between Iran and the P5+1 (US, UK, France, Russia, China and Germany) are toughening as they approach the July 20 deadline for a comprehensive deal based on the Joint Plan of Action (JPA) they signed in Geneva last November. While serious disagreements remain, significant progress has been made. Iran has almost fully complied with the terms of the JPA, and the P5+1 has agreed to allow Iran to enrich uranium to fuel its research reactors in Arak and Tehran under strict conditions. What divides them is the origin of fuel needed for Iran’s nuclear energy reactors. The P5+1 wants Iran to import the fuel while Iran insists on producing it at home.