During Buddhist times, a lot of positive cross-pollination happened between Buddhist Indics and Buddhist and Zoroastrian Iranics. But perhaps that did not do much to humour Hindu Indians. Some speculate that one reason the Iranics had an affinity for Buddhism was probably because Gautama Siddhartha himself was from the Shakya clan that supposedly had Iranic roots – and had Iranic traditions that ran counter to Vedic strictures, including sibling marriage.
We know that the post Zoroastrian Persians had a streak of iconoclasm if the Greek claims of their temple destruction during their invasion of Greece are to be believed. The Greek view is that their own sacrilege in Persia under Alexander was a payback. Much later Cicero also provides a religious motive for the Persian actions in Greece.
Considering all this the Hindus may not have been too eager to help the Iranians once they threw out the Greeks & unified themselves under the Mauryas.
“The Persians, on the other hand, regard all these forms of idolatry as impious, and it is affirmed that the sole motive of Xerxes for commanding the conflagration of the Athenian temples, was the belief that it was a superstitious sacrilege to keep confined within narrow walls the gods, whose proper home was the entire universe. Afterwards Philip, in his hostile projects against the Persians, and Alexander, in his expedition, alleged this plea for war, that it was necessary to avenge the temples of Greece. And the Greeks thought proper never to rebuild these fanes, that this monument of the impiety of the Persians might always remain before the eyes of their posterity.”
– Above is from Cicero