U.S. President Barack Obama, Russian President Dmitry Medvedev, and Kazakhstan President Nursultan Nazarbayev make a trilateral statement at the Nuclear Security Summit in Seoul, South Korea

President Nursultan Nazarbayev of Kazakhstan, President Obama, and Russian President Dmitry Medvedev make a statement at the Nuclear Security Summit in South Korea about a trilateral agreement between the three counties to secure loose nuclear material and prevent it from becoming vulnerable to smuggling or to potential terrorist plots. Nazarbayev and Medvedev use interpreters.