Iran has been aligned with the Soviets since the Ayatollah came to power.
But not even the Soviets or today Russians truly trust Iran completely.
Russia was reluctant in supporting the Iranian nuclear programs to the extent Iran wants, delivering certain weapon technologies in air defense, anti-ship missiles, etc.
However, Russia needed a surge in missiles and drones early on in the Ukraine war (Russia had a peacetime economy at wars begin, had a hard time meeting demand early on, and Iran was willing to deliver), and Iran is our enemy (the enemy of your enemy is your friend), so we can expect the Russians to significantly step up their cooperation with Iran.
Tit for tat.?
Right now it is widely believed that Iran is rolling out ballistic missiles targeting Israel. Right now.
Goodbye Kharg Island!,