Bedrin decided to kill Khromov from hostile relations

From a hostile relationship, Bedrin decided to kill Khromov. Late in the evening, he guarded her at the bus stop, dragged her into the forest. Then he struck a stone on the head with a stone, then he tried to strangle her with a metal wire and eventually cut her veins with a knife. However, making sure that the victim didn’t die from these injuries, Bedrin said, “I can’t do it anymore,” called an ambulance and left the scene of the crime, but was soon detained by law enforcement officials.
Does Bedrin see signs of voluntary refusal, and to what extent will he be held criminally liable?