伊朗核计划高风险谈判的未来仍笼罩在不确定性之中，因为美国和伊朗就特朗普政府提出的临时协议的条款公开发生冲突，该协议旨在为更持久的协议铺平道路。
伊朗最高领袖阿亚图拉·阿里·哈梅内伊(Ayatollah Ali Khamenei)在周三的一次讲话中抨击了该提议，称其“完全违背了我们的权力原则”，并誓言伊朗不会同意停止在自己的土地上进行铀浓缩，称其为“核计划中的一个关键工具”。
阿亚图拉讲话后不久，伊朗外交部长赛义德·阿巴斯·阿拉格奇(Seyed Abbas Araghchi)在X上的一个帖子中简洁地强调了伊朗的条件，写道“没有浓缩，就没有交易。”
伊朗的立场与总统形成鲜明对比唐纳德·特朗普他周一在社交媒体平台上强调了这一点。
"根据我们可能达成的协议，我们不会允许任何铀浓缩活动!"特朗普在Truth Social上写道。
虽然总统和他的内阁官员一再表示，根据协议条款，伊朗将被要求停止铀浓缩活动，但美国官员说，最初的临时提议(只是为了成为达成更广泛协议的垫脚石)并没有禁止伊朗进行低水平铀浓缩，同时可以建立一个为伊朗民用核能项目提供燃料的长期解决方案。
特朗普的帖子似乎与他的谈判代表表明的立场相矛盾，尽管伊朗尚未正式回应临时提议，但周三仍不清楚美国是否会袖手旁观最初提议中的所有条款。
伊朗和美国的代表团是否会在第六轮核谈判中会面仍不明朗，不过一位美国官员说，正在讨论未来几天可能的会面。
在周三与俄罗斯领导人弗拉基米尔·普京通电话后，特朗普表示，他希望莫斯科在与伊朗的谈判中发挥更大的作用。
特朗普在Truth Social上写道:“普京总统表示，他将参加与伊朗的讨论，或许他可以帮助迅速结束这件事。”“在我看来，伊朗在这个非常重要的问题上一直在拖延他们的决定，我们需要在很短的时间内得到一个明确的答复!”
但最近几天，美国和伊朗官员的乐观情绪似乎已经降温。
一名伊朗官员在接受美国广播公司新闻采访时表示，美国提出的条款是“不合理、贪婪和非传统的”，这名官员要求匿名讨论敏感谈判
“美国不断改变立场，这导致对其意图的不信任越来越多，并增加了对其履行承诺的意愿和严肃性的不确定性，假设任何协议都将形成，”他们告诉美国广播公司新闻。
“这份文件甚至还没有被公开审查或回应，”这位官员补充说。
伊朗正在争取解除严重损害国家经济的制裁。这个星期，伊朗外交部发言人埃斯梅尔·巴格艾说，德黑兰需要有关“真正结束制裁”的保证。
Baghaei在IRNA官方通讯社的评论中说，这将包括“如何和通过什么机制”解除制裁的细节。
阿拉格奇和哈梅内伊本周在评论中对美国的提议表示悲观。
伊朗外交部长周二在一份电报中表示，这份文件“有许多模糊之处和问题”。“这份提案中的许多问题都不清楚，”他补充道。
Critical US-Iran nuclear talks on shaky ground
The future of high-stakes negotiations over Iran's nuclear program remains shrouded in uncertainty as the U.S. and Iran publicly clash over the terms of an interim agreement proposed by the Trump administration that is intended to pave the way for a longer-lasting deal.
Iran's supreme leader, Ayatollah Ali Khamenei, slammed that proposal during an address on Wednesday, saying it "contradicts our principle of power by 100%" and vowing that Iran would not agree to stop enriching uranium on its own soil, calling it "a key tool in the nuclear program."
The Iranian foreign minister, Seyed Abbas Araghchi, succinctly underscored Iran's terms in a post on X shortly after the Ayatollah's speech, writing "no enrichment, no deal."
Iran's stance contrasts sharply with that of PresidentDonald Trump, which he emphasized on his social media platform on Monday.
"Under our potential Agreement -- WE WILL NOT ALLOW ANY ENRICHMENT OF URANIUM!" Trump wrote on Truth Social.
While the president and his Cabinet officials have repeatedly said Iran would be required to end enrichment activities under the terms of a deal, U.S. officials say that the initial interim proposal -- which is only intended to be a stepping stone to a broader agreement -- did not prohibit Iran from enriching uranium at low levels while a long-term solution to fuel Iran's civilian nuclear energy program could be established.
Trump's post appeared to contradict the position staked out by his negotiators, and although Iran has not yet formally responded to the interim proposal, it remained unclear on Wednesday whether the U.S. would stand by all the terms in its initial offer.
Whether delegations from Iran and the U.S. would meet for a sixth round of nuclear negotiations also remained unclear, although a U.S. official said a possible meeting in the coming days was under discussion.
After holding a phone call with Russian leader Vladimir Putin on Wednesday, Trump signaled that he would look to Moscow to play a greater role in negotiations with Iran.
"President Putin suggested that he will participate in the discussions with Iran and that he could, perhaps, be helpful in getting this brought to a rapid conclusion," Trump wrote on Truth Social. "It is my opinion that Iran has been slowwalking their decision on this very important matter, and we will need a definitive answer in a very short period of time!"
But optimism among both U.S. and Iranian officials appears to have cooled in recent days.
An Iranian official, who spoke with ABC News on the condition of anonymity to discuss sensitive negotiations, said that the U.S.' proposed terms are "unreasonable, greedy and unconventional."
"The U.S. constantly changes its positions, which has led to a growing accumulation of mistrust regarding its intentions and heightened uncertainty about its will and seriousness to fulfil commitments, assuming any agreement is even to be formed," they told ABC News.
"This document is not even open to be reviewed or responded to," the official added.
Iran is pushing for relief from sanctions that have badly damaged the national economy. This week, Iranian Foreign Ministry spokesperson Esmail Baghaei said Tehran needs guarantees regarding the "real end of the sanctions."
That would include details on "how and through what mechanism" they would be lifted, Baghaei said, in remarks carried by the official IRNA news agency.
Araghchi and Khamenei were downbeat on the U.S. proposal in comments this week.
The document has "many ambiguities and questions," the Iranian foreign minister said in a Telegram post on Tuesday. "Many issues in this proposal are not clear," he added.
