Iran supports and funds a number of Shia militia groups across the region. The Hezbollah in Lebanon, fighters in Syria as well as the Houthis in Yemen. Iran has been helping Syrian President Bashar al Assad against the Sunni rebels since the beginning of the Syrian civil war, while the Sunni factions are supported by the Arab world as well as the US and Europeans. Russia had sent in its fighters to keep Syrian President in power. He would have been driven out a long time ago without Russian backing. At the time of the Syrian civil war, the two factions were President Assad’s government, backed by Russia, Iran and the Sunni opposition fighters supported by the Sunni leaders of the Gulf, the US and European powers, as well as Israel. At that time, the Shia-Sunni rivalry was at its height. Concerned about Iran’s nuclear program, Saudi Arabia and the UAE made common cause with Israel, which saw Iran as a major rival in the region. Israel had often threatened to attack Iran’s nuclear facilities but was restrained by the US. When the Iran nuclear deal was signed during President Barack Obama’s second term, Israel, Saudi Arabia, and the UAE were the principal opponents. Donald Trump, as is well known, walked out of the deal and not much changed when the Democrats came to power. There was no easing of tension, and President Biden continues to target Iran as an enemy state.