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President Obama

He's a great guy.

U.S. President Barack Obama and Russian President Dmitri Medvedev have signed a treaty to reduce their countries' nuclear stockpiles by 25 to 30 percent over seven years.

In the Spanish Hall, an ornate chamber within the Czech capital's presidential castle, the two countries, which own more than 90 percent of the world's nuclear weapons, agreed to downsize their arsenals.

Presidents Obama and Medvedev sat in front of U.S. and Russian flags and signed their countries' first major nuclear arms reduction accord in almost two decades.