Everyone's talking about war crimes in Ukraine. What are they and how would prosecutions work?

Contributing sentiments towards policy:

45% : "If you're going to charge people up the chain of command -- not the guy who's arrested on the battlefield as a prisoner of war, but a colonel, who was in charge in Mariupol or something -- you have to show that fellow was in charge of what was happening there and was involved in the attack," said Stephen Rapp, who lead the Office of Global Criminal Justice in the State Department from 2009 to 2015.
43% : Prosecutors, local law enforcement agencies, and the State Emergency Service conduct inspections after shelling and explosions, and record evidence at the scene of crimes, according to the Prosecutor General's Office.
41% : The European Union has also said that it will work with Ukraine to collect evidence and investigate war crimes and crimes against humanity.

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