By Mark Trevelyan LONDON (Reuters) -Russia opened a criminal case against Facebook’s parent Meta Platforms on Friday after the social network changed its hate speech rules to allow users to call for “death to the Russian invaders” in the context of the war with Ukraine. Russian prosecutors asked a court to designate the U.S. tech giant as an “extremist organisation”, and the communications regulator said it was restricting access to Meta’s Instagram. “A criminal case has been initiated … in connection with illegal calls for murder and violence against citizens of the Russian Federation by em…