Are Russian diplomats being assassinated? (UPDATED)

Since the death of Vitaly Churkin I see more and more speculations that Russian diplomats are being killed (example here and here)  This is exceedingly unlikely and I consider these speculations to be based on ignorance and a form of “clickbaiting”.  Here is why: So four senior Russian diplomats have died in one month.  Considering how many diplomats Russia has worldwide, this hardly a tsunami. They died in Ankara (murder),