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.

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,

For the first time, an Iranian official has confirmed Western suspicions that Tehran has purchased the Russian-designed Sukhoi Su-35 fighter jet. Ali Shadmani, the deputy coordinator of the Khatam-ol-Anbia Central Headquarters and a senior official within the IRGC,

Just three days before US President-elect Donald Trump returns to the White House, Russia and Iran have finally signed a “comprehensive partnership agreement,” a deal that had been in the works for months.

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 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.

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

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.

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.

The necessity of entering into agreements with third countries to sustain the war challenges the Kremlin’s notion of military superiority.

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

Russian President Vladimir Putin and his Iranian counterpart Masoud Pezeshkian held talks in Moscow on Friday ahead of the signing of a strategic partnership treaty involving closer defense cooperation that is likely to worry the West.