WASHINGTON (AP) — The United States on Friday sanctioned more than 25 businesses, banks and individuals suspected of working to expand Iran’s nuclear program, support terrorism and help Iran evade U.S. and international sanctions.

The action is part of the Obama administration’s effort to show it will enforce existing sanctions even as it works with other world powers to negotiate a deal to curtail Iran’s nuclear program. Last year, they struck an interim deal that saw Iran agree to limit its uranium enrichment in return for the easing of some economic sanctions. Negotiators now face a November deadline to come to a final deal.