The Saturday protest was the latest in several weeks of demonstrations by supporters of the far-right focusing on corruption.
A journalistic investigation in February reported that figures close to President Petro Poroshenko and a factory controlled by him were involved in an embezzlement scheme. It has become a top issue in the heated campaign ahead of Ukraine's March 31 presidential election.
Poroshenko is trying to get re-elected, but a deep recession, endemic corruption and a war with Russia-backed separatists that has killed some 13,000 people since 2014 are weighing heavily on his ambitions.
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