NABU case used to force Shevchenko to resign as head of the NBU, says media The criminal proceedings opened by the National Anti-Corruption Bureau of Ukraine (NABU) in 2019 were a tool of pressure on the head of the National Bank of Ukraine (NBU), who refused to comply with the requirements of the Office of the President on hryvnia emission, lowering the discount rate and other regulatory decisions within the competence of the NBU.