Saudi Arabia and its allies directly interfered in this war. In fact, the struggle for Yemen is between Saudi Arabia and Iran, these two countries, using local forces (their allies), are trying to establish control over the strategically important Yemen.
The roots of the civil war in Yemen go back to the Arab spring that affected this country and the beginning of mass riots against the regime of Ali Abdullah Saleh. The effects of the Arab spring in Yemen did not differ from other Arab countries, such as Syria and Libya. As a result of the protests that began in Yemen and developed into violence, Saleh, after governing the country for 22 years (under the strict regime), was forced to resign in early 2012. Saleh, being wounded during an armed attack on the presidential residence, left his post and went to Saudi Arabia for treatment. His successor, Abd-Rabbu Mansur Hadi, replaced Saleh.
And the civil war in Yemen started since the Husits, committed to Zeidism (which is considered one of the branches of Shiism) and constituting the largest minority in the country, raised an uprising in the north of Yemen, collided with Sunni tribes, later seized the Yemeni capital and established dominance in a significant part of the country. When the Husits occupied Sana’a, President Mansour Hadi was first placed under house arrest, and then was forced to flee to Aden (an important port in the south of the country).
After the Husites attempted to capture Aden, and clashes began in the suburbs with the forces of President Mansour Hadi, Saudi Arabia directly intervened in the civil war in Yemen. The large-scale intervention by Riyadh (together with its allies) by air strikes prevented the control of the Husites from gaining control over the whole of Yemen, but the civil war between the Husites and the forces of President Mansour Hadi continued and hardened.
Today in Yemen there are two governments: the Husit and President Mansour Hadi. The government of President Mansour Hadi is recognized by the international community and represents Yemen at the UN. Mansour Hadi directly supports Saudi Arabia and its allies, while it is known that the Husitians are Iran. Saudi Arabia claims that Iran, along with political and financial support, has been helping the Husite for a long time with weapons and ammunition; missiles that fly towards Saudi Arabia from the areas of the Husit distribution, they are also supplied by Iran.
Yemen has evidently become an important zone of conflict within the framework of the struggle that is going on between Saudi Arabia and Iran and spreads to the entire Middle East. In the air forces formed by Saudi Arabia with the aim of direct intervention in the civil war in Yemen, many Arab countries (such as Egypt, Morocco, Sudan, and Bahrain) directly contribute. The UAE has become another country in the region, which, along with Saudi Arabia, most directly interferes in the war in Yemen. The US also provides logistical support to Saudi Arabia in this war.