NICOLE GRAJEWSKI is a Fellow in the Nuclear Policy Program at the Carnegie Endowment for International Peace and an Associate with the Project on Managing the Atom at the Harvard Kennedy School. She is the author of Russia and Iran: Partners in Defiance From Syria to Ukraine.

Iran has purchased Russian-made Sukhoi-35 fighter jets, a senior Revolutionary Guards commander said on Monday, amid Western concerns about Tehran and Moscow's growing military cooperation.

Russia and Iran signed a mutual defense and security cooperation pact on Jan. 17 — just days before President Trump’s inauguration. Both nations are primary opponents of the U.S., demonstrated by Russia’s war against Ukraine and Iran’s attempts to assassinate Trump,

The presidents of Russia and Iran have held talks in the Kremlin before the signing of a broad cooperation pact to deepen their partnership amid stinging Western sanctions.

Russian President Vladimir Putin and his Iranian counterpart Masoud Pezeshkian deepened military ties between their countries on Friday by signing a 20-year strategic partnership that is likely to worry the West.

The agreement is focused more on trade than military issues, but it will bring two countries with a shared desire to challenge the West closer together.

The Islamic Republic appears to be replacing the storied Tomcats with modern Sukhoi Su-35 jets. T he Islamic Republic of Iran Air Force has a motley mix of antiquated U.S. aircraf

While Moscow and Tehran have shared warmer relations for decades, a revival of the nations’ allyship occurred when the former invaded Kyiv.

Russian President Vladimir Putin and Iranian President Masoud Pezeshkian will meet in Moscow to sign a partnership pact as the two nations brace for President-elect Trump's return.

Iran and Russia signed a 20-year strategic partnership treaty. It outlines significant economic and military cooperation.

Iranian President Masoud Pezeshkian told his Russian counterpart Vladimir Putin he believed their two countries could finalise agreements on the construction of a nuclear power plant in Iran as the tw

Russian President Vladimir Putin and Iranian President Masoud Pezeshkian signed a broad cooperation agreement, deepening their already growing partnership.