Iran's Top Negotiator Qalibaf Says We Have Never Welcomed War And Do Not, But We Must Always Be Ready To Fight And Stand To The End To Safeguard Our National Security And Interests; We Must Also Use The Tools Of Diplomacy And Negotiation To Realize And Secure National Interests; We Are In An Essential And Existential War With America, Whose Aim Besides Toppling Iran's System Is To Fragment Our Beloved Country, Iran; Says 'Enemy' Strategy Has Not Changed