It's not a war crime of the people poisoning the fruit are not combatants. They could probably be tried for manslaughter, and I doubt Russia would be very lenient.
People don't get a 'get out of war crimes' card by not being officially in the military. If they purposefully took hostile action in the conflict they're combatants, uniformed or not. The use of poison is a war crime.
Yes they do. This act falls under the purview of civilian enforcement. It is up to the controlling government to prosecute these civilian crimes in civilian criminal court.
EDIT: Okay, so this particular argument irked me so I investigated. Unfortunately, Ninja is technically correct. According to the ICRC civilians receive an instantaneous removal of their status as non-combatant for the duration of the hostile act, and the ICC's Rome Statutes clearly list using poison as a warcrime so it is probable the perpetrators could be prosecuted. More likely, however, is that their being subject to civilians laws means they can ALSO be prosecuted in the civilian manner. Double the risk for the reward.
That said. Russia wants to FAFO that's their problem.
No, civilians could be charged for war crimes. Nazis like Martin Borman and Julius Streigher were civilians charged for war crimes. Nevertheless the truth is on our side, russians should all rot and die in pain
It's a pretty big stretch to call leaders of the Nazi party civilians. This argument is like saying Putin's cabinet aren't guilty of warcrimes because they aren't soldiers. If you're in a position to effect policy and/or give orders that result in warcrimes at the very least you do not fit into the category of civilian we're discussing.
Sadly enough, both Maria Lvova-Belova and these civilians that poison food are complicit in war crimes. Yes, different war crimes, different even from a moral standpoint. Yes, I understand your urge to kill every ruski pig you encounter, but this doesn't lie in a legal plane.