Havemt you learnt the system yet... Russia never wants an outside investigation when these horrors occur, the Ukraine wants independent organisations of high rep to investigate. The horrors are tracked to the Russians by the investigation.
The Ukrainians known who blew up the prison, it wasn't them... Russians, probably the Wagner group, equivalent to the SS in nazi times.
I believe the Russians are responsible so many clues...
The Americans probably have rocket tail fire tracking from satellites.
