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Feb. 26 (UPI) — The third round of U.S.-Iran nuclear talks concluded Thursday in Geneva with signs of progress and plans for further negotiations, amid heightened tensions between Tehran and Washington as President Donald Trump threatens military action if a deal is not reached.

Oman said after the day-long talks that progress had been made and more talks are needed.

“We have finished the day after significant progress in the negotiation between the United States and Iran,” Minister Badr bin Hamad Albusaidi of Oman said in a statement.

“We will resume soon after consultation in the respective capitals.”

Minister Abbas Araghchi of Iran concurred with his Omani counterpart. Further progress had been made, he said.

“This round of talks was the most intense so far,” he said in a statement.

“It concluded with the mutual understanding that we will continue to engage in a more detailed manner on matters that are essential to any deal — including sanctions termination and nuclear-related steps.”

Technical-level discussions are scheduled to start in Vienna on Monday, officials said.

Representatives from the United States did not immediately comment.

The negotiations were indirect, with Iran and the United States communicating through Omani mediators.

There was a four-hour meeting in the morning followed by more than two hours of discussions in the afternoon, according to Araghchi, who said IAEA Director General Rafael Grossi’s involvement “was valuable for the technical discussions.”

“Regarding some issues, there is no understanding, and on others, it’s natural that we have differences,” Iran’s top diplomat said.

“However, there was perhaps more seriousness on both sides than before, with the aim of reaching a negotiated solution.”

Trump is seeking to secure a long-term deal aimed at preventing Iran from securing a nuclear weapon, a decades-long fear of Washington and Israel, and has threatened military action if negotiations falter.

The removal of sanctions appears to be Iran’s most pressing issue for Iran, as its economy has been under severe strain from years of sanctions imposed amid the years-long impasse over its nuclear program.

Ahead of the Thursday talks, Foreign Ministry spokesman Esmaeil Baghaei of Iran told reporters that Tehran’s delegation had come fully prepared.

“Right now, the relevant experts in the fields of sanctions relief and economic issues, as well as nuclear and legal matters, are with us, and we are prepared to continue these talks as long as necessary,” he said, the Islamic Revolutionary Guard Corps-affiliated Fars News Agency reported.

“As far as we are concerned, we are here with full preparedness and seriousness in order to realize the country’s national interests.”

He added that they will be watching for “contradictory statements” between what U.S. officials say in the meetings and what they tell the press.

“These contradictions do not help advance this diplomatic process and increase doubts and suspicions about their purpose and intentions,” he said.

Grossi and Oman’s Albusaidi held a meeting Thursday before the talks officially kicked off on technical matters related to Iran’s nuclear dossier.

The second round of talks was held earlier this month, with Araghchi stating that an agreement had been reached “on general guiding principles.”

However, significant gaps remained between the United States and Iran.

Though it officially began Thursday, Iran’s Foreign Ministry said in a statement that Araghchi met with Albusaidi on Wednesday night and conveyed Tehran’s views on nuclear-related issues and the lifting of sanctions.

Araghchi stressed to the representative of Oman that “the success of the negotiations depends on the seriousness of the other side and its avoidance of contradictory behavior and positions.”

Trump has pursued a new nuclear deal with Iran since early in his first term, when in 2018 he unilaterally withdrew the United States from a landmark Obama-era multinational accord aimed at preventing Tehran from securing a nuclear weapon.

The first Trump administration applied a maximum pressure campaign of sanctions and economic pressure to coerce Tehran back to the negotiating table. Under the economic coercion, Iran began breaching its nuclear commitments and advanced its enrichment program.

Then, under the Biden administration, the United States attempted to revive negotiations with Iran — an effort that stalled by the fall of 2022 and was shelved when Iran-backed Hamas attacked Israel on Oct. 7, 2023.

Last June, after Trump was elected to a second term, he ordered strikes on three known nuclear sites as the United States joined Israel’s military campaign against Tehran. The White House later claimed Iran’s facilities had been “obliterated,” though international inspectors have not been able to gain access to them to verify the extent of the damage.

Despite the assertion, Trump has expanded the United States’ military presence in the Middle East in recent weeks ahead of the talks, sparking worries it may precede another attack if negotiations falter.

During his State of the Union address to a joint session of Congress on Tuesday night, Trump said Iran is seeking to restart its program but also wants to make a deal with the United States.

“They are at this moment again pursuing their sinister ambitions,” he said without providing proof. “My preference — my preference is to solve this problem through diplomacy. But one thing is certain, I will never allow the world’s No. 1 sponsor of terror — which they are by far — to have a nuclear weapon. Can’t let it happen.”