Well, looking at the Geneva convention and Article 8 “War Crimes” of the Rome Statute of the International Criminal Court, “Intentionally using starvation of civilians as a method of warfare by depriving them of objects indispensable to their survival, including wilfully impeding relief supplies as provided for under the Geneva Conventions.”

And one committing a crime doesn’t allow the other to do the same. So either get pissed at both sides for war crimes or get pissed at none. But trying to excuse war crimes for one side in a war is a disgustingly hypocritical thing to do.