U.S. President Barack Obama and Russian President Dmitry Medvedev pause before signing the new Strategic Arms Reduction Treaty (START II) at Prague Castle in Prague, April 8, 2010. The United States and Russia signed a landmark disarmament treaty on Thursday they hope will herald better bilateral ties and raise pressure on countries seeking nuclear weapons to renounce such ambitions. Presidents Obama and Medvedev signed the pact at a ceremony in the mediaeval Prague Castle after talks that covered nuclear security, Iran's atomic programme and an uprising in the strategic Central Asian state of Kyrgyzstan.
REUTERS/Jason Reed (CZECH REPUBLIC - Tags: POLITICS IMAGES OF THE DAY)