On March 2, Roman Nasirov, the head of the State Fiscal Service of Ukraine, was arrested on abuse of office charges. The National Anti-Corruption Bureau of Ukraine (NABU) has accused Nasirov of fraud and embezzlement amounting to $74 million. The Nasirov case is Ukraine’s biggest test in the fight against corruption so far, and it’s a very big deal. Ukraine must get it right. In spite of lofty rhetoric and new anticorruption institutions, Ukraine hasn’t successfully prosecuted any high-level officials since the EuroMaidan.

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