Poor Tanya! She is doing everything according to the international rules of warfare to make sure that her ass is covered...
...BUT...
Historically speaking, it's the WINNERS of a war who determine who will be charged with war crimes. As shown by the results of WWII when the Germans lost and were charged with numerous war crimes, but the British and the Americans were NOT charged with the crimes of firebombing the cities in Germany and killing untold numbers of civilians in the process.
War is HELL!!! The Winners will almost always get away with atrocities and the Losers will always get fucked. That is just the way it has always been. Hell, in pre-modern times, it was common practice to wipe out an enemy to the last man, woman and child in order to eliminate the possibility of any future retribution and revenge by any survivors. Very brutal, but also very efficient.