Iran on Saturday said it now uses arrays of advanced centrifuges prohibited by its 2015 nuclear deal and can enrich uranium “much more beyond” current levels to weapons-grade material, taking a third step away from the accord while warning Europe has little time to offer it new terms.

While insisting Iran doesn’t seek a nuclear weapon, the comments by Behrouz Kamalvandi of the Atomic Energy Organization of Iran threatened pushing uranium enrichment far beyond levels ever reached in the country. Prior to the atomic deal, Iran only reached up to 20%, which itself still is only a short technical step away from weapons-grade levels of 90%.

The move threatened to push tensions between Iran and the U.S. even higher more than a year after President Donald Trump unilaterally withdrew America from the nuclear deal and imposed sanctions now crushing Iran’s economy. Mysterious attacks on oil tankers near the Strait of Hormuz, Iran shooting down a U.S. military surveillance drone and other incidents across the wider Middle East followed Trump’s decision.