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U.S. President Barack Obama and Russian counterpart Dmitri Medvedev say they still plan to have a replacement nuclear arms reduction treaty ready by the end of the year.
The two presidents met in Singapore Sunday after the close of the Asia-Pacific Economic Cooperation forum.
The two leading nuclear powers have committed to a replacement for their Strategic Arms Reduction Treaty, which expires on December 5.
Earlier this year, Mr. Obama and Mr. Medvedev agreed to reduce Cold War-era stockpiles from 2,200 warheads to somewhere between 1,500 and 1,650.
That agreement is part of a commitment from both leaders to reset bilateral relations strained in recent years by differences over NATO expansion and the brief Russian-Georgian war of 2008.
Some information for this report was provided by AFP, AP and Reuters.