Iran really need to upgrade its air force as it is essential for increasing their anti-air capabilities. Aircraft can both function as mobile radars and have striking capabilities to target tankers and by making enemy aircraft busy and working on defensive maneuvers instead of just dropping bombs. B2 can be vulnerable to air to air engagements, especially long range air to air and surface to air strikes, since they rely more on their stealth capabilities than maneuverability.

That said, any anti-aircraft capability is still secondary to developing their nuclear program. The game will only be over after Iran develops its nuclear arsenal.

Today, Iran is very likely to win against Israel and the US due to their strategical depth and ballistic capabilities. Let’s keep in mind Iran still hasn’t used their top grade missiles. However any prolonged conflict would also destroy the Iranian economy, so it would be a Pyrrhic victory for Iran and for the resistance axis. This is why it is imperative that they can reach nuclear dissuation to prevent a direct conflict.