Iran will continue scaling back compliance with a nuclear deal unless other signatories to the pact show “positive signals”, the Iranian president said on Saturday as tensions with the United States escalated over tanker attacks in the Gulf region, Reuters reports.

Iran stopped complying in May with some commitments in the 2015 nuclear deal that was agreed with global powers, after the United States unilaterally withdrew from the accord in 2018 and ratcheted up sanctions on Tehran.

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“Obviously, Iran cannot stick to this agreement unilaterally,” President Hassan Rouhani told Russian, Chinese and other Asian leaders at a conference in Tajikistan.

His comments follow rising tensions with Washington, which has accused Tehran of carrying out Thursday’s attacks on two oil tankers in a vital oil shipping route at the mouth of the Gulf. Tehran has denied having any role.

Rouhani did not refer to this week’s tanker incident in his speech to the Conference on Interaction and Confidence Building Measures in Asia, behind held in the Tajik capital Dushanbe.