Russian President Vladimir Putin has congratulated Mojtaba Khamenei on taking the position as Iran's new supreme leader, and reaffirmed Moscow's support for Tehran.
"Please accept my sincere congratulations on your appointment as Supreme Leader of the Islamic Republic of Iran," Putin said in a message published on the Kremlin website.
The Russian leader added that he "reaffirms (Russia's) unwavering support for Tehran and solidarity with our Iranian friends" and promises to "remain a reliable partner."
"At a time when Iran is facing armed aggression, your actions in this high position will undoubtedly require great courage and dedication. I am convinced that you will honorably continue the work of your father and unite the Iranian people in the face of this grave test," Putin said.
Mojtaba Khamenei is the son of Ayatollah Ali Khamenei, who was killed on the first day of the US-Israeli attacks on Iran, on February 28.
