Gods are with Iran!
All of Iran's military and political leaders were already assassinated. Iran does not have the military capabilities to beat Isreal, let alone the single most powerful military in the world, which also happens to be across the Atlantic Ocean, much too far out of range for any of Iran's current missiles.
Many countries and groups will send help to Iran.
This I can assure you is not happening. Other than the surrounding countries of the middle east (which are considerably weaker than Iran), no country will come to help them. Russia is currently way too busy with Ukraine, China might help but that would be bad for them as they would lose business with the US, crippling their economy, and inviting enemies of China to aid the US. There are no other allies of Iran that would pick them over the US.