The U.S. will terminate a sanctions waiver for Iran’s fuel enrichment plant at Fordow, citing Tehran’s threats to increase uranium enrichment, Secretary of State Mike Pompeo announced Monday.

The decision, Pompeo said, is in response to Iran’s decision to resume uranium enrichment at Fordow, a move to build pressure on Europe to provide it with the economic benefits Iran is supposed to receive under the 2015 nuclear deal it struck with world powers.

Read more: US to terminate sanctions waiver for Iran's Fordow site