Gulf countries led the international donations to aid the humanitarian crisis in Syria, totaling US$4 billion, United Nations Secretary General Ban Ki-moon announced in Kuwait Tuesday.
The U.N. aims to provide aid to 18 million people in the country, devastated more than four years of civil war, plus others in the region strained by the deluge of refugees.
The organization is appealing for US$8.4 billion to tackle the catastrophe.
Kuwait promised $500 million, the United Arab Emirates $100 million and Saudi Arabia $60 million, while the United States pledged the single largest sum of US$507 million.
Those countries have faced allegations of intervening into the crisis, seeking to oust Syrian President Bashar Assad , a stated goal of U.S foreign policy. They have also faced allegations of arming the Syrian opposition.
Last week, the three Gulf donor countries and the U.S. became involved in an additional Middle East intervention.
The states have formed part of a Operation Decisive Storm, a Saudi-led coalition to bomb Yemen, in an attempt to overcome the opposition Houthi rebels, who have gained control of most of Yemen, including the capital of Sanaa, and ousted President Abdu Rabu Mansour Hadi.
"Rockets from the Saudi-American aggression continue to fall on the Shida and al-Hisama districts on the Yemen-Saudi border," the Houthi TV channel al-Maseerah said.
Khaled, a resident of the northern province Haradh, said to Reuters, "The bombing today is worse than on any other day and we hear sounds of explosions and see Saudi planes in the air."