Iran will send a delegation to Islamabad for talks with the United States on Tuesday after repeatedly refusing to commit to a new round of negotiations.
Tehran is yet to confirm its attendance but sources told The Wall Street Journal that officials would take part in a second round of talks.
JD Vance will lead the American delegation. Donald Trump said earlier on Monday that the US vice-president was already on his way to Pakistan, before the White House later clarified that he would depart the US on Monday evening.
Iran has publicly downplayed the possibility of reaching a deal, blaming excessive demands by the US. On Monday evening, Abbas Araghchi, the Iranian foreign minister, accused Washington of “continued ceasefire violations”.
Masoud Pezeshkian, the Iranian president, said earlier that Tehran maintained a deep, historical mistrust of the US, adding that “Iranians do not submit to force”.
Mr Trump, meanwhile, talked up the prospect of a deal on Monday, claiming it would be “far better” than the one negotiated by his predecessor, Barack Obama.
However, he also said he was “highly unlikely” to extend a ceasefire, warning that bombing would resume if a deal was not reached by the deadline on Wednesday evening.