Tehran is "cautiously optimistic" about its negotiations on ending hostilities with the United States, the Iranian ambassador to the United Nations said Thursday, expressing hope for a "meaningful outcome."

"Despite our deep mistrust of the United States, stemming from its repeated betrayal of diplomacy, we nevertheless entered the negotiations in good faith and remain cautiously optimistic," Amir Saeid Iravani said during a meeting of the UN General Assembly.

He added that if Washington adopts "a rational and constructive approach … these negotiations can lead to a meaningful outcome."