By FARNOUSH AMIRI and DAVID RISING

DUBAI, United Arab Emirates (AP) — Iran’s Supreme Leader Ayatollah Ali Khamenei said on Thursday his country had delivered a “slap to America’s face” with its strike on an American base in Qatar, and warned against any further U.S. attacks in his first public comments since a ceasefire was declared with Israel after 12 days of war.

Khamenei spoke in a recorded video broadcast on Iranian state television, his first appearance since June 19. The 86-year-old looked and sounded more tired than he did only a week ago, speaking in a hoarse voice and occasionally stumbling over his words.

The more-than 10 minute speech by the supreme leader was filled with warnings and threats directed toward the United States and Israel.

He downplayed Sunday’s U.S. strikes on three Iranian nuclear sites using bunker-buster bombs and cruise missiles, saying that U.S. President Donald Trump — who said the attack “completely and fully obliterated Iran’s nuclear program — had “exaggerated” its impact.

“They could not achieve anything significant,” he said.

UN nuclear watchdog confirms damage to Iran sites

The head of the U.N. nuclear watchdog, International Atomic Energy Agency Director Rafael Grossi, reiterated on Thursday that the damage done by Israeli and U.S. strikes at Iranian nuclear facilities “is very, very, very considerable.”

“I think annihilated is too much but it suffered enormous damage,” Grossi told French broadcaster RFI.

Iran’s Foreign Ministry spokesman, Esmail Baghaei, on Wednesday also conceded that “our nuclear installations have been badly damaged, that’s for sure.”

Khamenei has not been seen in public since taking shelter in a secret location after the outbreak of the war June 13 when Israel attacked Iranian nuclear facilities and targeted top military commanders and scientists.

Following Sunday’s U.S. attack on Iran’s nuclear facilities, Trump was able to help negotiate a ceasefire that came into effect on Tuesday.

Iranian leader warns US against further attacks

Khamenei claimed the U.S. had only intervened in the war because “it felt that if it did not intervene, the Zionist regime would be utterly destroyed.”

“It entered the war to save them, yet it gained nothing,” he said.

He said his country’s attack on the U.S. base in Qatar on Monday was significant, since it shows Iran “has access to important U.S. centers in the region and can act against them whenever it deems necessary.”

“The Islamic Republic was victorious and, in retaliation, delivered a hand slap to America’s face,” he said, adding “this action can be repeated in the future.”

“Should any aggression occur, the enemy will definitely pay a heavy price,” he said.

Since the ceasefire, life has been gradually returning to normal in Iran.

On Thursday, Iran partially reopened its airspace, which had been shut down since the war broke out, and shops in the capital of Tehran began to reopen, with traffic returning to the streets.

With the ceasefire, life slowly returns to normal in Iran

Majid Akhavan, spokesperson for the Ministry of Roads and Urban Development, said Iran had reopened the airspace for the eastern half of the country to domestic and international flights, including those transiting Iranian airspace.

Earlier this week, Tehran said 606 people had been killed in the conflict in Iran, with 5,332 people wounded. The Washington-based Human Rights Activists group released figures Wednesday suggesting Israeli strikes on Iran had killed at least 1,054 and wounded 4,476.

The group, which has provided detailed casualty figures from multiple rounds of unrest in Iran, said 417 of those killed were civilians and 318 were security forces.

At least 28 people were killed in Israel and more than 1,000 wounded, according to officials there.

During the 12-day war, Iran fired more than 550 missiles at Israel with a 90% interception rate, according to new statistics released by Israeli authorities on Thursday. Israel, meantime, hit more than 720 Iranian military infrastructure targets and eight nuclear-related sites, Israel said.

Trump has also asserted that American and Iranian officials will talk next week, giving rise to cautious hope for longer-term peace.

Iran has not acknowledged any such talks would take place, though U.S. Mideast envoy Steve Witkoff has said there has been direct and indirect communication between the countries. A sixth round of U.S.-Iran negotiations was scheduled for earlier this month in Oman but was canceled after Israel attacked Iran on June 13.

Iran has insisted that it will not give up its nuclear program. In a vote underscoring the tough path ahead, its parliament agreed Wednesday to fast-track a proposal that would effectively stop the country’s cooperation with the IAEA, which has monitored the program for years.

Associated Press writer John Leicester in Paris and Natalie Melzer in Nahariya, Israel, contributed to this report.