They disagreed in political debate, father and son cut off the ex-cop's head and feed on his flesh.

Maxim and Yroslav Costyukov, 42-year-old and 21-year-old, were sentenced for the murder of Yevgeny Petrov, 45-year-old in Ukraine, broadcast Periscopi.

They'll be standing behind bars for 15 years. The three were reportedly drunk together when a conflict began over the disputes of Kiev forces and pro-Moscow rebels in the eastern part of the country.

The court heard confessions of how Petrov had held the victim from behind until his father had stabbed him twice.

Yaroslav Costyukov then cut off his ex-cop's head and took his skin off, his heart, his kidneys, his lungs and other internal organs.

He then confessed how he cooked the meat, which he served for food when his father and son waited in the house for a homeless man named Yura.

Yaroslav later changed his statement, denying that he cooked the meat, saying he barely ate his share.

He just chewed his first bite, according to his statement. He said the homeless person ate most of the plate.

However, police said there are clear signs that the pair was cannibal and had cooked and eaten the victim's flesh. /Periscope. com/