Military settlement of the Nagorno Karabakh conflict will be a catastrophe, OSCE Minsk Group Russian Co-chair Yuri Merzlyakov told PanARMENIAN.Net reporter. In his words the conflicting parties should exert every effort to prevent hostilities. According to Merzlyakov, tension of the situation by Azerbaijani will not bring to good. "We should aspire for peace and the potential of peaceful resolution has not been exhausted yet," he underscored.