Tehran seeks to step up defense cooperation with Moscow, and the sides have no disagreements concerning the use of Iran's Hamadan airbase by Russian planes, the Islamic Republic's ambassador to Russia told Sputnik.

Tehran is looking for ways to broaden the scope of defense cooperation with Moscow, Iranian Ambassador to Russia Mehdi Sanaei told Sputnik on Tuesday.

"Iran is interested in continuing cooperation in defense area with Russia and even in expanding and developing it. I hope that even in those sectors that require coordination with the UN Security Council and need a resolution. I hope that the process of discussing the possibility of obtaining such a permit will begin," Sanaei said.

Commenting on the delivery of Russia's S-400 air defense systems to Tehran, the ambassador noted that such an issue was not under discussion.