Russian Prime Minister Vladimir Putin and President Dmitry Medvedev offered condolences to Polish leaders and vowed a thorough probe into the crash that killed Polish President Lech Kaczynski on Saturday, news agencies reported. Putin voiced sympathy over the "tragic" crash in a phone call with his Polish counterpart, Donald Tusk, said the spokesman for the Russian prime minister, Dmitry Peskov. "Vladimir Putin called Prime Minister Donald Tusk and expressed condolences over the tragic plane crash near Smolensk to him and to the entire Polish people," Peskov told Russian news agencies. "I have given an order to carry out a detailed investigation of the accident with complete and close cooperation with the Polish side," Medvedev said in a message to Bronislaw Komorowski, the Marshal of the Sejm -- head of the Polish parliament -- who is set to take over Kascynski's duties.