Russian military investigators have launched a criminal case in connection with the crash of a Mi-24 helicopter in Armenia.This was reported by Interfax.According to the agency, the criminal case was filed under Article 351 of the Criminal Code of the Russian Federation (violation of the rules of flight or flight preparation).It is noted that Russian, Azerbaijani and Armenian investigators are currently taking preliminary investigative measures. They inspected the scene of the accident and appointed several experts.