Russia's Prime Minister Vladimir Putin (C) holds a five-year-old tiger's head as scientists put on a collar with a satellite tracker on the animal in the academy of sciences Ussuri reserve in Russia's Far East in this August 31, 2008 file picture. Putin, China's premier Wen Jiabao and other world leaders will hold an unprecedented summit this week in a last ditch effort to save the tiger from extinction. [China Daily/Agencies]