A summit of the post-Soviet CSTO security bloc leaders opened in Moscow on Sunday in the absence of the Belarusian president, who pulled out of the meeting in protest against Russia`s trade restrictions. Pictured: l-r Armenian President Serzh Sargsyan , Kazakh President Nursultan Nazarbayev , Kyrgyz President Kurmanbek Bakiyev , Russian President Dmitry Medvedev , Tajik President Imomali Rakhmon , Uzbek President Islam Karimov and the Collective Security Treaty Organization`s Secretary General Nikolai Bordyuzha at the Collective Security Treaty Organizatio summit in Moscow Kremlin on June 14, 2009