UNITED NATIONS (AP) — A U.N. treaty to regulate the multibillion-dollar global arms trade will have to wait after member states failed to an reach agreement, and some diplomats and supporters blamed the United States for the unraveling of the monthlong negotiating conference.

"This was stunning cowardice by the Obama administration, which at the last minute did an about-face and scuttled progress toward a global arms treaty, just as it reached the finish line," said Suzanne Nossel, executive director of Amnesty International USA. "It’s a staggering abdication of leadership by the world’s largest exporter of conventional weapons to pull the plug on the talks just as they were nearing an historic breakthrough."