The cooperation between Iran and Pakistan has dwindled in the past two weeks, a diplomatic source told the Saudi Al-Hadath channel.
According to the source, distrust is making coordination between the two countries increasingly difficult.
The report added there are stark contrasts in the parties' positions regarding the negotiation channels and the location of the talks. It was also claimed that Pakistan’s Interior Minister is expected to return to Tehran soon.
Earlier this month, US officials told CBS News that several days after US President Donald Trump announced a ceasefire with Iran in early April, Tehran sent multiple aircraft to Pakistan Air Force Base Nur Khan near Rawalpindi. Among the aircraft was reportedly an Iranian Air Force RC-130 reconnaissance plane.
The officials, who spoke on condition of anonymity due to the sensitivity of the matter, said the aircraft movements reflected attempts by Iran to shield assets while Pakistan publicly positioned itself as an intermediary between Tehran and Washington.
US Central Command declined to comment directly and referred CBS News to Pakistani and Afghan authorities.
A senior Pakistani official denied the claims regarding Nur Khan Air Base, telling CBS News that the facility is located in the middle of the city and that a large number of aircraft could not be concealed from public view.
According to an Afghan civil aviation officer quoted in the report, an Iranian civilian aircraft operated by Mahan Air landed in Kabul shortly before the conflict began and remained there after Iranian airspace was closed.
The official said the aircraft was later moved to Herat Airport near the Iranian border after Pakistani airstrikes on Kabul during tensions with the Taliban government. Afghan authorities reportedly relocated the plane out of concern that Kabul Airport could become a target.
The Afghan aviation officer stated that this was the only Iranian aircraft remaining in Afghanistan.
Taliban spokesman Zabihullah Mujahid denied that Iranian aircraft were present in Afghanistan, telling CBS News that the claim was untrue and that Iran had no need for such measures.