Russia-Iran partnership treaty to start new chapter in relations -- Pezeshkian / Russia-Iran treaty different from ones with DPRK, Belarus -- diplomat / Russia-Iran partnership treaty to let signatories resist US sanctions -- Iranian expert / Iran-Russia relations developing thanks to Putin's efforts -- official / Russian, Iranian presidents outline plan for further contacts -- Kremlin / Russian and Iranian leaders meet amid escalating Middle East conflict / Russia wants to bring cooperation with Iran to higher level -- Russian prime minister / Pezeshkian vows to establish deeper Russia-Iran ties / Relations between Iran, Russia to develop on permanent basis -- Iranian president / Friendly Russian-Iranian relations obtained additional impetus in past years -- Putin