can. of course it is very difficult. a city such as mariupol where clear evidence of war crimes exists, what happens when the russians conquer that city and records are destroyed. in the electronic age when so much of this information has already been transmitted what it is possible to verify through technical means the kind of visual evidence on the ground, a lot of the stuff will have been gathered and already transmitted to places where it can be kept safely. a fascinating account of some of the tensions fill in play even as the nuremberg war trials began is to be found on bbc podcast series called the trial of the nazi warm criminals which is