Iran announced Friday it was activating new advanced centrifuges – which enrich uranium for the country’s nuclear program – after the United Nations’ nuclear watchdog criticized the country for not cooperating with the agency.

Iran said it will increase the number of centrifuges in its nuclear program in response to a censure by the United Nations’ nuclear watchdog, ratcheting up tensions with the West just days after it signaled a willingness to ease them.

The U.N. nuclear watchdog’s board has condemned Iran for failing to cooperate fully with the agency, the second time it has done so in just five months.