investigating conflicts for 25 years in places like the balkans, iraq, syria, and libya. bill, we're grateful to have you this morning. thanks for sharing part of your weekend with us. on the surface, this seems obvious. we've seen what seems like countless images of ukrainian civilians suffering from russian attacks in residential areas, areas that do not appear to be military bases or operations in any way. but you've noted that the footage that documents what we've seen thus far is useless in an international court. why is that? >> useless is perhaps overstating it but it's of minimal relevance, that shows us the crime base, but ultimately we need to understand the intent of the attacking force and to get at that, we need materials generated by that attacking force, documentation, signals