"The IMF board of directors has postponed for a short period the review planned for Monday of the issue," Ukraine's finance ministry said in a statement.
There was no separate confirmation from the IMF.
Cash-starved Ukraine is desperately waiting for the next instalment of a USD 17.5 billion rescue programme that has been held up repeatedly since it was agreed in 2015 over delays by Kiev to carry out reforms.
But that deal appears to have been rocked by Ukraine's decision on Wednesday to halt trade with pro-Moscow insurgents that it has been battling since 2014.
The pro-Western leadership in Kiev took the drastic step after rebels seized dozens of Ukrainian-owned businesses on their territory in response to a trade blockade by nationalist protesters.
Kiev also slapped sanctions on the Ukrainian subsidiaries of five Russian banks -- including state-run giants Sberbank and VTB -- in part over Moscow's decision to officially recognise identity documents issued by the rebels.
"Clarifying these calculations is important for both sides to ensure the maximum effectiveness of the programme," said finance minister Oleksandr Danylyuk.
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