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A top foe of Russian President Vladimir Putin who spent a decade behind bars told thousands on Kiev's main protest square Sunday that the Kremlin colluded with Ukraine's ousted regime in violence claiming 100 lives. Former oil tycoon Mikhail Khodorkovsky received a rousing reception on Independence Square -- the crucible of three months of protests that ousted a pro-Russian regime from power last month -- as he walked out on stage dressed in a black parka and his hair still styled in a prison crew cut. They did this with the agreement of the Russian leadership," Khodorkovsky said in an emotional address delivered under a clear blue sky and televised live by several Ukrainian national television stations. Khodorkovsky was once Russia's richest man and an influential politician with presidential ambitions who openly opposed Putin when the former KGB spy first entered the Kremlin in 2000.