Why was Demyanenko shot up? The sites I've read are dreadful translations (hence no links), but it seems that he drove away from a checkpoint without being cleared. And/or that he was taking pictures.
There was also yesterday's case of two journalists who drove away fast from a checkpoint (and for excellent reasons): two journalists shot up in Ohtyrka.
In this case they fled from a checkpoint (because a shell burst nearby) and were then shot up by an anonymous gunman.
Not sure there are enough dots here for a pattern: except maybe that checkpoints are very sensitive places, and people with cameras seem to be priority targets.
I briefly entertained the possibility that Renaud was killed because he had the word “Peacekeeper” prominently displayed: this word may have a different resonance in Ukraine.
But he didn’t have it written in cyrillic, so probably nothing to it.