The Houthis, a military rebel group from Yemen, have joined the Iran war, complicating the situation for the United States. This gives Iran another ally in the war and could exacerbate global energy and shipping crises. The Houthis control territory along key Red Sea shipping routes, which could potentially threaten global trading lanes. The Iran war has already disrupted oil exports and shipping lanes due to the closure at the Strait of Hormuz. The group's involvement has already caused oil prices to rise above $116 per barrel. The rebels have also threatened to attack other countries in the Gulf, including Saudi Arabia and the United Arab Emirates. The United States and the Houthis have a long-standing relationship, with President Trump designated as a terrorist group in 2025.