Lagarde says in a statement "it is hard to see how the IMF-supported program can continue and be successful" without a crackdown on corruption and a new push for governance reforms.
Ukraine is still waiting for the IMF to provide an installment of funding that has been delayed since October amid disputes over the budget.
Last week, Ukrainian Economy Minister Aivaras Abromavicius resigned, saying his reform efforts had been blocked by government colleagues.
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