Russian and Iranian officials say the "comprehensive strategic partnership treaty" covers all areas -— from trade and military cooperation to science, education and culture.

Iran has long sought an alliance to protect it in the face of potential conflict with adversaries, but the text of the agreement falls short of obligating either party to provide military support in the event of foreign aggression.

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.