"The team which is in talks over debt restructuring is having consultations with colleagues from the International Monetary Fund," Artem Shevalev said.
Ukraine owes Russia $3 billion in Eurobonds. The debt was secured by the government of then-President Viktor Yanukovych in late 2013. Moscow has repeatedly stated that Kiev's failure to pay back the debt by the December 20, 2015, deadline should be classified as a default.
Moscow disagrees with Kiev's stance that the bond is part of an external commercial debt, arguing that the bond is a loan provided by one country to another.
Earlier this month, Russian Finance Minister Anton Siluanov said Russia would be filing a lawsuit against Ukraine before February.