Anadolu Agency - Iran�s deputy foreign minister said Tuesday that recently re-imposed U.S. sanctions had served to make his country�s 2015 nuclear deal with world powers �untenable�, warning that Tehran itself could withdraw from the agreement.

Abbas Araqchi described the 2015 deal as a �great political achievement�, reiterating Iran�s commitment to complying with the deal�s terms, Iran�s state-run IRNA news agency reported.

Iran and the P5+1 group of nations (the five permanent UN Security Council members plus Germany) signed the deal in July of 2015.

�But the U.S. sanctions, which have been re-imposed despite the International Atomic Energy Agency�s confirmation that Iran has complied with the deal�s terms, have made the agreement much less beneficial,� Araqchi told IRNA.

�The recent re-imposition of sanctions has brought revenue accruing to Iran as a result of the deal almost to zero,� Araqchi lamented.

Tensions between Washington and Tehran have mounted since May, when U.S. President Donald Trump unilaterally withdrew his country from the 2015 agreement.

In August, the U.S. re-imposed a first round of sanctions that mainly targeted Iran�s banking sector.

A second phase of sanctions -- targeting Iran�s energy sector -- came into effect on Nov. 5, although Washington granted a 180-day reprieve to the eight largest buyers of Iranian oil, including Turkey.