Iran seeks a nuclear showdown with America. In the Iranian view, Israel exists only as an American colony. They wouldn't mind "liberating the Shia" of the oil-producing Gulf States, by transferring those regions to Iranian control, either. No doubt they'd like to kill off a bunch of Sunnis as well.
U.S., allies conduct 31 air strikes in Syria and Iraq against ISIS militants (Reuters)
from the article: What to do with Ahmadinejad