Let's see where the numbers go from here, after today's big event.

Unlike North Korea, which has only T-62 and towed artillery pieces to sell back to Russia, Iran has quite a lot of former Soviet equipment, though many have received Iranian upgrades.

Iran was also looking for production licenses for the T-90 (Although for this one they produced a domestic Ersatz vehicle in the meantime, the Karrar) and more advanced vehicles than the BMP-2 and BTR-60, which russia could deliver now and get some of their older vehicles back in return. This could include BMP-1 and 2, BTR-50 and 60, T-72Z and Samar (heavily upgraded T55/Type 59, though they use a 105mm main gun, so that one is pretty unlikely), Some T-62, ~500 T-72S (export version of the T-72B) and it's upgraded Rakhsh variant. Funnily enough, they also have quite a few American tanks from before the revolution, and their domestic Zulfiqar tank is based on the M-60 features a Russian 2A46 main gun.

And of course, Russia is certainly interested in more Shahed drones from Iran and potentially to launder their oil through Iran - though Iran is also restricted in that regard.