Photo taken on April 18, 2013 shows the scene of the Russia Forum 2013 in Moscow, Russia. The forum, as a discussion floor of the world's leading economists and politicians, opened on Thursday in Moscow. (Xinhua/Liu Hongxia)

Former U.S. Secretary of State Colin Powell attends the Russia Forum 2013 in Moscow, Russia, April 18, 2013. The forum, as a discussion floor of the world's leading economists and politicians, opened on Thursday in Moscow. (Xinhua/Liu Hongxia)

Former British Prime Minister Tony Blair (L) and former U.S. Secretary of State Colin Powell attend the Russia Forum 2013 in Moscow, Russia, April 18, 2013. The forum, as a discussion floor of the world's leading economists and politicians, opened on Thursday in Moscow. (Xinhua/Liu Hongxia)

Former Foreign Minister of China Li Zhaoxing attends the Russia Forum 2013 in Moscow, Russia, April 18, 2013. The forum, as a discussion floor of the world's leading economists and politicians, opened on Thursday in Moscow. (Xinhua/Liu Hongxia)

Former British Prime Minister Tony Blair attends the Russia Forum 2013 in Moscow, Russia, April 18, 2013. The forum, as a discussion floor of the world's leading economists and politicians, opened on Thursday in Moscow. (Xinhua/Liu Hongxia)