"The leaders are expected to make a joint statement after the summit, which will reflect the key areas of further cooperation between the three countries", the press service said.
Putin, Rouhani and Aliyev also discussed plans for establishing a railway line between Iran, Azerbaijan and Russian Federation that could be used to move freight from Asia to Europe. "We are able to agree our positions on the Syrian issues", the Russian leader said, according to Sputnik.
The two generals met in Tehran as part of efforts for expansion of military cooperation between the two countries.
Putin met Iranian political leaders in an effort to nurture a warming relationship strengthened since U.S. President Donald Trump threatened recently to abandon the worldwide nuclear deal with Iran reached in 2015.
"We have evaluated the security situation in the region in details, discussed the issues related to the Iranian nuclear deal and, of course, focused on the situation in Syria". "The joint cooperation and consultations are very important in the final stages too". Putin also held a separate meeting with Iran's Supreme Leader Ali Khamenei.
Russian President Vladimir Putin exits his plane on arrival at Mehrabad airport in Tehran, Iran, Wednesday, Nov. 1, 2017.
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Earlier in the day, Putin sat down for talks with his Iranian counterpart, Hassan Rouhani.
Russian Federation also has helped Iran's nuclear power program, taking part in construction of two more nuclear power reactors in the southern port city of Bushehr, home of the first Iran's nuclear power plant that went online in 2011 with Moscow's assistance.
U.S. President Donald Trump has lambasted the deal and refused to confirm whether his government will comply with it.
The European Union and the other parties to the deal- Russia, Britain, China, France, and Germany - have all urged Trump not to pull the United States out.
Rouhani also said Tehran will welcome Russian investors and private firms willing to undertake development and other projects in Iran.