Russian Investigative Committee spokesman Vladimir Markin said the investigation and criminal proceedings against suspect Valery Permyakov "will be held exclusively on Armenian soil."
However, it said that the proceeding "all procedural activities will be conducted in accordance with international laws," Russian legislation, and agreements between Russia and Armenia governing Russia`s military base in the city of Gyumri, where Permyakov was stationed and is now being held.
Russian newspaper Novaya Gazeta and the kavkaz-uzel.ru website cited Armenian government sources as saying the trial would be conducted by a Russian military court in Armenia.
Authorities say Permaykov has confessed to the killings, which led to angry protests by demonstrators demanding he be prosecuted and tried in Armenia.
The Russian statement coincided with a candle-lighting ceremony commemorating Seryozha Avetisian, a six-month-old boy who was stabbed in the attack and died on January 19.
His parents, two-year-old sister, aunt, and grandparents were found dead in their home on January 12.
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