Russia?s Prime Minister Vladimir Putin (L in the centre) and his Polish counterpart Donald Tusk (R in the centre) take part in a wreath laying ceremony at a memorial complex at Katyn, some 350 km (217 miles), west of Moscow April 7, 2010. The memorial has been erected on the spot of the 1940 massacre where thousands of Polish officers were killed by the Soviet secret police. REUTERS/Sergei Karpukhin (RUSSIA)