Iran: the head of the snake

Until 1979, Iran was under the Sha. It was a relatively friendly country to Israel. Then, in 1979, the Islamic Revolution of took place. They overthrew the government of the Sha, and established a radical Islamist regime, renaming the country the Islamic Republic of Iran, and all kinds of troubles have come since. It then became the most hostile country to Israel, and you could say now it's
the 'head of the snake', supplying Israel's enemies with weapons.