Iran will hold the United States accountable for the coming Israeli attack.
The Iranian Embassy at the United Nations in New York City said this afternoon, "President Biden’s remarks in Berlin on Friday, stating he knows “when and how” Israel will attack Iran, amount to “tacit approval and explicit support” for Israel’s “illegal aggressive actions” against Iran.
They added, “The United States will bear full responsibility for its role in any Israeli act of aggression against Iran.”
It is widely believed that this means Iran WILL make good on its word to "hit all U.S. Bases in the Middle East" if/when Israel attacks.
A map showing the U.S. bases in the region, appears below: