Source: Al Jazeera [Qatari state media]
“Planned talks in Switzerland between the United States and Iran to discuss the technical terms of their ceasefire deal have been postponed. The Swiss Foreign Ministry confirmed early on Friday that the talks, which were scheduled to take place in Burgenstock, would not go ahead. The postponement has raised fears that the ceasefire deal signed by the US and Iran earlier this week could unwind already. Reports suggest that Iran has delayed sending its delegation to discuss the technical issues linked to the ceasefire deal – digitally signed by the two countries on Wednesday – due to Israel’s ongoing military campaign in Lebanon. … Chief negotiator Mohammad Bagher Ghalibaf said on Friday that any talks would remain bound by Tehran’s ‘red lines.’ A halt to Israel’s attacks on Lebanon was one of Tehran’s key demands in negotiations around the deal.” [editor’s note: Israel is not, so far as I know, a party to the deal – TLK] (06/19/26)
https://www.aljazeera.com/news/2026/6/19/us-iran-talks-postponed-as-israel-attacks-lebanon