Ayatollah Khamenei, the Leader of the Islamic Republic of Iran received Russian President Vladimir Putin, on Wednesday in Tehran.
Earlier in the day, Putin sat down for talks with his Iranian counterpart, Hassan Rouhani.
Trump last month disavowed the 2015 accord to curb Iran's nuclear program that was negotiated between Tehran and the U.S., Russia, France, Germany, the United Kingdom and China.
Trump has called the agreement "the worst deal ever negotiated" and branded Iran a "terrorist nation" for involvement in conflicts in the Middle East.
"We are managing to coordinate our positions on the Syrian issue", Putin said.
Russian Federation has rejected Trump's demand to renegotiate the agreement to curb Iran's ballistic missile program. Referring to recent considerable promotion of cooperation between two countries, he added, "we are firm in our relation with Iran and we won't let anyone to interfere in the relation of the two country". After the meeting the three Presidents will issue a joint statement.
Putin was in Tehran to take part in the second three-way summit with Rouhani and Azeri President Ilham Aliyev.
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"We oppose any unilateral change in the multilateral nuclear deal", Putin told Khamenei, Iranian state TV reported.
The corridor, serving as a bridge to connect the railroads of Iran, Azerbaijan and Russian Federation, is to provide faster and more efficient trade connectivity between Europe and Southeast Asia.
President of Azerbaijan Republic also highlighted the cooperation between the two countries in cultural, economic, investment, energy and transportation sectors saying that his government is involved in efforts to build (more) mosques in the country.
President Putin of Russia and President Aliyev of Azerbaijan both arrived in Tehran on Wednesday to attend the trilateral meeting of Presidents of Iran, Russia, and Azerbaijan.
On the sidelines of the Tehran summit, Iranian and Russian officials signed six memorandums of understanding on improving collaboration in the field of oil and gas.
The Russian leader pointed out that he was satisfied with the meeting's outcome.