According to the new report released by the Dutch-led Joint Investigation Team on the downing of Malaysian Airlines flight MH17, the names of senior Russian government officials have been mentioned in the released recording of phone calls.
It states that there was almost daily telephone contact between separatist fighters in eastern Ukraine and Moscow.
The report also suggests that Russia's influence went beyond military support.
The investigation team is now appealing for more witnesses to come forward ahead of the trial of three Russians and one Ukrainian charged with murder in connection with this case.
Russia's foreign ministry says the phone recordings are false and have not been confirmed.
Al Jazeera's Step Vaessen has more from Ukraine's capital, Kyiv.