May be he should tell the officer he's going to call the UA police hotline to complain: 0-800-50-02-02 (toll free). I hope he knows the department address and he has someone local near him to make a call for him. Or may be some bluff would do the thing.
One should learn more about the department location and the man himself to explain the situation.
Could some Ukrainian redditor maybe call it in his name?
I read his comment. He's in Visa and registration department in Odessa. I'm not sure the police has jurisdiction here.