Six Arab nations are urging the United Nations to extend an arms embargo on Iran, siding with the United States in a dispute that could end the 2015 nuclear deal.

“Iran has continued to proliferate conventional weapons and arm terrorist and sectarian organizations and movements throughout the region,” the Gulf Cooperation Council said in a bulletin announcing that a letter was sent Saturday to the U.N. “It is imperative to extend those restrictions to ensure and preserve peace and stability in this region and the rest of the world.”