Iran’s supreme leader said on Sunday that a compromise with the West over Tehran’s nuclear program was conceivable if the country’s nuclear infrastructure remained intact, amid a standoff between Tehran and Washington over the renewal of a 2015 nuclear agreement.

Months of indirect discussions between Tehran and Washington to resurrect the nuclear agreement with six major powers have been stuck since September, with both sides accusing the other of unrealistic demands.

Ayatollah Ali Khamenei’s guarded approval comes days after both Tehran and Washington denied a report that they were nearing an interim deal under which Tehran would curb its nuclear programme in return for sanctions relief.

“There is nothing wrong with the agreement (with the West), but the infrastructure of our nuclear industry should not be touched,” Ayatollah Ali Khamenei said, according to state media.

In 2019, Iran began breaching the deal’s terms in response to a U.S. withdrawal in 2018 under then-President Donald Trump.

The 2015 agreement limited Iran’s uranium enrichment activity to make it harder for Tehran to develop nuclear arms, in return for lifting international sanctions.

In 2018, then-U.S. President Donald Trump exited the pact and reimposed sanctions that have crippled Iran’s economy, leading Tehran to gradually move well beyond the deal’s nuclear restrictions and reviving U.S., European and Israeli fears that Iran may seek an atomic bomb.

Echoing Iran’s official stance for years, Khamenei said the Islamic Republic has never sought to build a nuclear bomb.

“Accusations about Tehran seeking nuclear weapons is a lie and they know it. We do not want nuclear arms because of our religious beliefs. Otherwise they (the West) would not have been able to stop it,” said Khamenei.

Khamenei, who has the last say on all state matters such as Iran’s nuclear programme, said the country’s nuclear authorities should continue working with the U.N. nuclear watchdog “under the framework of safeguards”.

Last month, the International Atomic Energy Agency reported limited progress over disputed issues with Iran, including re-installing some monitoring equipment originally put in place under the 2015 pact that Tehran ordered removed last year.