Tehran and Moscow on Tuesday signed an agreement to increase military and defense cooperation.
Defense Minister Brigadier General Hossein Dehqan and his Russian counterpart General Sergei Shoigu signed the agreement after a meeting in Tehran.
The two ministers also emphasized the importance of maintaining regional and international peace, security and stability as well as countering all types of terrorism, separatism and extremism.
Fars news agency reported the two sides also agreed to settle a long-running dispute over a deal on Russian-made S-300 air defense systems. Russia's RIA state news confirmed the issue was once again under discussion.
"A step was taken in the direction of cooperation on the economy and arms technology, at least for such defensive systems such as the S-300 and S-400. Probably we will deliver them," RIA quoted Colonel General Leonid Ivashov as saying.
Ivashov is the former head of the defense minister's department of international cooperation.
Moscow and Tehran signed an $800 million deal in late 2007, but three years later Russia decided not to ship the S-300 missile systems to Iran under the pretext that it is covered by the fourth round of the United Nations Security Council sanctions against Tehran over its nuclear energy program.
In 2013, Russians announced that Iran-bound S-300 anti-aircraft systems were dismantled and recycled.
Following Moscow's failure to deliver the systems, Iran filed a complaint against the Russian arms firm Rosoboronexport with the International Court of Arbitration in Geneva.
In a joint press conference, Dehqan said, "The current regional developments have demonstrated that a strong Russia can have long-lasting impact on international peace and security through cooperation with Iran."
Dehqan said Iran and Russia share common views on political, regional and global issues, adding that the two countries can make use of their capabilities to display a model for bilateral cooperation.
Dehqan pointed to Iran's role in combating terrorism and said Iran has acted "responsibly" with regard to fighting terrorism, providing aid to regional governments and enhancing regional stability and security. The Russian defense minister arrived in Tehran at the head of a delegation of senior officials late on Monday.
For his part, General Sergei Shoigu said both Iran and Russia are facing "common challenges and threats", emphasizing, "Through joint cooperation, the two countries can overcome these challenges and threats."
He also praised Tehran's "key" role in the fights against terrorism and drug smuggling in the region and called for joint cooperation between the two countries to deal with the issues.
