Iran will continue scaling back its compliance with its nuclear deal commitments in the absence of "positive signals" from other signatories to the pact, Iranian President Hassan Rouhani told a meeting of Russia, China and other Asia leaders in Tajikistan.

Iran stopped complying in May with some commitments in a 2015 nuclear deal that was agreed with global powers, a year after the United States unilaterally withdrew from the accord and tightened sanctions.

Tehran has said in May that, unless world powers protected its economy from U.S. sanctions within 60 days, Iran would start enriching uranium at higher level.