This article gives the case status:
“Charges were brought both in Russia and Armenia. Joint work is underway now. Let’s wait until the trial and then we will decide what to do,” [Chief Russian military prosecutor Sergey Fridinsky] said, adding that after the completion of the investigation, a decision will be made about which court will hear the case.
“Eventually, the Supreme Court [editor's question: Russian or Armenian?] has the right to decide issues related to jurisdiction in exceptional cases”, Fridinky said noting that “no one has so far taken a final decision”.