Iran and the International Atomic Energy Agency have agreed to a one-month extension of a monitoring agreement that was due to expire in late May.
On Monday, IAEA Director General Rafael Grossi revealed that both sides agreed to extend the pact until June 24. The deal allows inspectors to monitor nuclear sites in Iran.
The move came at a time when indirect talks between the United States and Iran are underway in Vienna about reviving the 2015 nuclear agreement.
Iran has threatened to end its cooperation with the UN nuclear watchdog if negotiators fail to agree on the removal of US sanctions and other issues by late May.
There is still no breakthrough in the talks, as both sides are at odds over conditions for lifting the sanctions.
An Iranian foreign ministry spokesperson said the monitoring agreement extension has left room for further negotiations in Vienna.
Western countries aim to reach a deal with Iran as soon as possible amid fears that Iran's presidential election next month could put a hardline administration in power.
The indirect talks in Vienna are scheduled to resume this week.