https://en.m.wikipedia.org/wiki/William_Calley#Murder_trial
Feel free to criticize Nixon for getting involved but the U.S. prosecutes soldiers who commit war crimes. Even in Vietnam. And when people try to cover it up, U.S. service members have the moral courage to push back.
Russia intentionally encourages, even orders, soldiers to commit war crimes. There are no prosecutions for it. There is no comparison.