The UN’s atomic agency, the International Atomic Energy Agency (IAEA), said Wednesday it will need more funds from member states to help pay for its monitoring of an extended interim nuclear deal between Iran and six world powers, according to Reuters.

Iran and the United States, France, Germany, Britain, China, and Russia failed to meet a November 24 deadline for resolving a 12-year-old dispute over Iran’s nuclear program and gave themselves until the end of June for further negotiations.

As a result, a preliminary agreement reached late last year, under which Iran halted its most sensitive nuclear activity in exchange for limited sanctions easing, will remain in force. It was designed to buy time for the talks on a final settlement.

The International Atomic Energy Agency (IAEA) has seen its workload increase significantly under the preliminary accord, including its inspectors visiting Iran’s uranium enrichment facilities of Natanz and Fordo daily, compared to about once a week before.

The preliminary accord was initially due to run for six months from January but first extended in July and again this week.

The IAEA did not say how much more money it would need. It earlier this year asked for voluntary financial contributions of about 6.5 million euros to cover its extra Iran-related costs.

Because of the deal’s political importance, diplomats have said there should be no problem raising the required funds.

“Taking into account the extension period, additional contributions will be required,” senior IAEA official Serge Gas said in an email to Reuters. “The agency will communicate with member states as soon as we identify our needs.”

The UN agency’s “verification effort in Iran has doubled” under the interim accord, IAEA Director General Yukiya Amano told the United Nations General Assembly this month.

Iran’s President, Hassan Rouhani, on Monday welcomed the extension of talks and hailed it as “victorious” for Iranians.

“We have neither compromised over Iran’s nuclear rights, nor will ever do so, and there is no doubt that the Iranian nuclear technology will remain functioning,” he said, adding, “Our nation has emerged victorious and will be victorious.”

Iranian Supreme Leader Ayatollah Khamenei also responded to the extension of talks and declared that the European Union and the United States had failed to stop his country from achieving nuclear power.