U.S. President Barack Obama (L) and his Russian counterpart Dmitry Medvedev sign a landmark nuclear arms reduction treaty in Prague, capital of Czech Republic on April 8, 2010. [Wu Wei/Xinhua]
![U.S. President Barack Obama (L) and his Russian counterpart Dmitry Medvedev sign a landmark nuclear arms reduction treaty in Prague, capital of Czech Republic on April 8, 2010. [Wu Wei/Xinhua]](../../attachement/jpg/site1007/20100409/0019b91ec8450d29172008.jpg "U.S. President Barack Obama (L) and his Russian counterpart Dmitry Medvedev sign a landmark nuclear arms reduction treaty in Prague, capital of Czech Republic on April 8, 2010. [Wu Wei/Xinhua]")
