Tehran, May 18 -- Iran confirmed on Monday that indirect negotiations with the United States are actively continuing through Pakistani mediation. However, Tehran firmly signalled it will not compromise on its "nuclear rights," even as U.S. President Donald Trump issued a fiery weekend warning that "time is of the essence."

According to ISNA, Iranian Foreign Ministry spokesperson Esmaeil Baghaei said Tehran had exchanged proposals and corrective points with Washington through Pakistan.

"The negotiations are ongoing and not temporary," Baghaei said during his weekly press conference.

The back-and-forth exchange reportedly follows a structured, albeit rocky, format. Iran initially submitted a 14-point framework to address outstanding issu...