The window for Iran to secure a nuclear deal with the United States may be closing faster than either side has publicly acknowledged. Just days before military strikes erupted across the Middle East on 28 February, diplomats reported negotiations had reached a critical juncture, with apparent breakthroughs on uranium enrichment and international verification. Today, four weeks into active conflict, that diplomatic pathway looks increasingly remote.
Oman's Foreign Minister Badr Al-Busaidi said on 27 February that a breakthrough had been reached, with Iran agreeing both to never stockpile enriched uranium and to full verification by the IAEA, and that peace was within reach. Talks were scheduled to resume on 2 March. They never did.
The immediate problem is geography and timing. The Israeli army began ground operations in southern Lebanon on 16 March 2026, transforming what had been ceasefire violations into a full-scale invasion. Finance Minister Bezalel Smotrich said the new Israeli border must be the Litani River, a critical waterway that cuts through southern Lebanon, about 30km from the border with Israel. Israeli Defence Minister Israel Katz said on Tuesday that the military will maintain control of southern Lebanon up to the Litani River, adding that hundreds of thousands of Lebanese living in the area will not be allowed to return until security is guaranteed for Israel's northern communities.
This territorial expansion fundamentally changes the negotiating environment. Iran has long used Lebanon and its proxy forces as a key element of its regional strategy. A permanent Israeli occupation of southern Lebanon removes a lever Tehran might have used in any settlement. The Lebanese government, which Iran had cultivated as an ally, is now actively moving against Iranian interests; the Lebanese government this week expelling the Iranian ambassador, giving him until Sunday to leave the country.
Yet the deeper problem is one of collapsed trust and competing narratives. While Iranian Foreign Minister Abbas Araghchi acknowledged that messages have been exchanged with the US through mediators, he stressed that communications do not amount to negotiations, saying that messages being sent and responses does not constitute negotiation or dialogue, but rather an exchange of messages. Trump, meanwhile, has insisted negotiations are active. The gap between these two positions is not rhetorical; it reflects genuine disagreement about whether talks of any substance are occurring at all.
The United States has reportedly sent a 15-point peace plan to Iran. The terms reportedly include dismantling key nuclear facilities, accepting permanent international inspection, and ceasing support for regional militia groups. But the White House said talks with Iran are not at a dead end even after Tehran did not immediately accept the 15-point plan to end the war. Tehran has not formally rejected it; it has instead questioned whether genuine negotiations exist to reject anything from.
There are legitimate reasons for Iran's scepticism. By the time the third round of talks ended in Geneva, Trump had likely already made the decision to go to war, and it is unlikely that any outcome short of complete Iranian capitulation to US demands at the negotiating table would have averted the strikes. The military buildup had been visible for weeks. Beginning in late January 2026, the United States carried out its largest military buildup in the Middle East since the 2003 invasion of Iraq. When a government assembles that level of force whilst claiming to negotiate, it sends a clear signal about its true intentions.
Yet from the US perspective, the complaint is different. The Trump administration argues Iran has consistently used negotiations as cover whilst advancing its nuclear program. In December 2024, the UN nuclear watchdog IAEA reported enrichment to levels approaching weapons-grade. Whether negotiation is plausible depends partly on whether Iran would genuinely accept the constraints the US demands and partly on whether the US would accept anything less than complete capitulation.
The practical reality is that the moment for a deal has almost certainly passed. Military operations in Lebanon will dominate Iranian strategic thinking for months. The Lebanese government's shift against Iran removes a key piece of Iranian regional influence. And the demonstrable gap between what Trump claims is happening in negotiations and what Iran says is happening suggests no shared understanding exists about what agreement would even look like.
Australia has direct interest in this outcome. A prolonged Middle East conflict disrupts shipping, pushes up energy prices, and creates unpredictable demands on alliance commitments. The calculation that Australia's strategic interests are served by a sustainable, negotiated limitation on Iranian nuclear capabilities is reasonable. But the calculation that military force can achieve what diplomacy failed to accomplish is harder to justify, especially when the other side has watched negotiations proceed in parallel with military strikes.