Meanwhile, the United States topped the list of global arms merchants in 2015, driving about half of all weapons sales worldwide. A new report from the Congressional Research Service finds that, despite an overall drop in the global arms trade, U.S. weapons exports increased to about $40 billion in 2015, and the U.S. appears on track to post similar numbers in 2016. Among developing nations, Saudi Arabia was the leading buyer, purchasing over $93 billion in arms since 2008. Most of those weapons were made in the U.S. and included F-15 fighter jets, Abrams battle tanks and cluster bombs. U.S. arms were used in attacks on Yemen, where U.N. officials have called for an international probe into possible war crimes by the Saudi-led coalition.