Helicopters and armoured vehicles advance in formation during the final stage of the Peace Mission 2007 counter-terrorism drill, sponsored by the Shanghai Cooperation Organization, in Chelyabinsk in Russia's Ural Mountains region, August 17, 2007. Leaders and defense ministers from SCO's six member countries gathered in the Chebarkul military range near Chelyabinsk in the morning to observe the drill, which is also due to end on Friday. [Xinhuanet]