The secretary of Russian President Vladimir Putin's Security Council will reportedly visit Iran early next week.
The Russian news agency Interfax cited a source as saying Nikolai Patrushev is expected to discuss bilateral cooperation,
regional security and the issue of Iran's nuclear program during meetings with Iranian officials.
Russia is one of six global powers involved in negotiations to rein in Iran's nuclear program in exchange for the removal of sanctions imposed on the Islamic country over activities that have caused concern it could be seeking nuclear weapons.
The nations reached an interim agreement with Iran last year and have set a November 24 deadline for a final deal.
Russia built Iran's first nuclear power plant and its ties with Tehran are warmer than relations between Iran and Western nations such as the United States.
Based on reporting by Interfax