Future Of Iranian Air Force

I know that this topic has been discussed earlier, but what if there are no sactions?
The current president of Iran is acting quite okay and there may be an ease of the bans.
Just forget the politics!
What if tommorow, the US and Europe lifts its Sanctions against Iran?
What will Iran will buy?
Which supports Iranian Economy and there military doctorine?
Ps: Ofcourse to destroy the Jewish State