If Moscow doesn't make concessions by October 29, Ukraine will refuse to pay the loan, said Yatsenyuk.
"This $3 billion was in reality a bribe from Russia, so that President Viktor Yanukovich would stop the Association Agreement with the EU," he added.
Ukraine has repeatedly said that its debt to Russia is private. The current IMF policy only allows member states to miss payments to private investors. Kremlin insists that Kiev's debt is a state one and is ready to go to court if Ukraine fails to pay in December.
The question of Russian debt is crucial to Ukraine, because the country's possible default would put into jeopardy a $17.5 billion loan promised by the IMF.
However, according to Russian Finance Minister Anton Siluanov, the IMF is ready to change the rules especially for Ukraine. Officially, the IMF's decision is motivated by a general change in the rules of the organization's funding, but "it is clear that this is done exclusively in order to freeze payments to Russia," Siluanov said.
#Kiev should 'walk away' from $3bn debt to Moscow - US senator http://t.co/WjKmeRktBs pic.twitter.com/ZSMjWjadAD
— RT (@RT_com) September 25, 2015
Comment: Ukraine can't afford to defend itself in court. Russia isn't likely play around either. Regardless, it will be interesting to see what the IMF does.