This is a very difficult and sad reality of war. The approaching soldier put his life in grave danger to give them an opportunity to surrender and live. He obviously didn't want them to die but they resisted too long and left the trained soldier with little choice in my opinion if he wanted to see his family again. The Ukrainian on the left would have likely survived if the one on the right would not have struggled with the Russian. It was a wartime decision, and no one can question that decision if you were not in the Russians shoes. They were in a pitched battle and in war your life is the most important one. The Russian made a decision, and it was probably the best one he had.