Censor.NET reports referring to National Police deputy chief Vadym Troian's Facebook page.
The gang was tracked shortly after the incident, Troian said.
He added that Tuesday morning, a group of criminals portraying Ukraine's Security Service agents abducted a director of a construction company and asked for a $500,000 ransom.
"The victim was tortured with a plastic bag over his head.
"The youngest abductor is only 20 years old. Another member of the gang is a former GRU officer who used to serve in hot spots. The police seized automatic weapons. No one was hurt during the operation," Troian wrote.