The deposed Iraqi ruler and two aides were sentenced to hang November 5.
"We proceed from the fact that the trial over a citizen of any country, no matter what post he could have previously occupied, is the internal affair of that state and must be conducted and brought to an end without any prompts from outside," Russian Foreign Ministry spokesman Mikhail Kamynin said.
Kamynin said the sentence had caused contradictory response in some Arab states and sparked the fears that the existing instability in the country would increase.
"In the current uneasy conditions in Iraq, it is especially important to avoid any situations, which could further split the Iraqi society and complicate the search for national accord through a broad inter-Iraqi dialog with the participation of all political and ethno-confessional forces," Kamynin said.