"In intensive talks at the highest level in 47 years, Iran engaged with U.S. in good faith to end the war," Araghchi wrote in a message posted on his X network on Monday morning.

"But when just inches away from Islamabad MoU, we encountered maximalism, shifting goalposts, and blockade," he explained the reasons the negotiations between Washington and Tehran ended without a breakthrough.

"Zero lessons learned," Araghchi rebuked the American negotiators, arguing that "Good will begets good will.  Enmity begets enmity".

Top officials from Iran and the United States met in Islamabad on Saturday to discuss a permanent end to the US-Israeli war of aggression against the Islamic Republic, days after a two-week ceasefire between Tehran and Washington mediated by Pakistan.

The 21 hours of marathon talks in Islamabad ended without a deal that Iran blamed on the United States’ excessive and irrational demands.

The high-ranking delegation of the Islamic Republic of Iran, led by Parliament Speaker Mohammad Bagher Ghalibaf, and accompanied by Araghchi, departed Islamabad for Tehran on Sunday afternoon.