"According to the information we have, an autopsy revealed that the victim had numerous serious injuries, including a fracture of four ribs and a closed head injury. This gives reason to assume a deliberate murder of a Russian citizen", the ministry said in a statement.
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According to the head of the prison, Ivanov died from injuries sustained as a result of falling from a stepladder during the replacement of a light bulb, the ministry noted.
"We continue to keep the situation under control, we are counting on an unbiased and objective investigation of the death of the Russian citizen", the Russian Foreign Ministry underlined.
The Consulate General of Russia in Lviv is in contact with the Ukrainian police, according to the statement.