Iran is planning “one last step” in its gradual draw-down from complying with the nuclear deal, raising the possibility that it’s close to announcing a complete withdrawal from the embattled international accord.

In addition to the five-stage reduction of its commitment that Iran has already announced, it’s now working on the final measure that will have “more effective consequences,” Abbas Mousavi, Foreign Ministry spokesman, told a news conference in Tehran on Monday.

Earlier this month, Iran announced it’s no longer observing limits on uranium enrichment or research and development activities, but insisted it was still working within the parameters of the deal and would continue cooperating with United Nations nuclear inspectors.

In a move that has worsened tensions with Tehran, the UK, France and Germany said last week they would trigger the deal’s dispute resolution mechanism, which could eventually mean the matter being referred to the UN Security Council. Mousavi said the move “lacks legal value” and that an “empty-handed” EU is unlikely to risk a major escalation in its standoff with Iran by involving the UN’s top decision-making group.

Days before European nations turned up pressure on the Islamic Republic, the US and Iran came to the brink of war after Trump ordered the killing of top Iranian general Qassem Soleimani. As Iranian forces launched retaliatory attacks on US facilities in the Middle East, they accidentally shot down a Ukrainian airliner over Tehran, triggering protests against the regime.