In this photo released by an official website of the office of the Iranian supreme leader, Supreme Leader Ayatollah Ali Khamenei delivers his sermon in the Friday prayers at Imam Khomeini Grand Mosque in Tehran, Iran, Friday, Jan. 17, 2020. Iran's supreme leader said President Donald Trump is a "clown" who only pretends to support the Iranian people but will "push a poisonous dagger" into their backs, as he struck a defiant tone in his first Friday sermon in Tehran in eight years. (Office of the Iranian Supreme Leader via AP)

In this photo released by an official website of the office of the Iranian supreme leader, Supreme Leader Ayatollah Ali Khamenei delivers his sermon in the Friday prayers at Imam Khomeini Grand Mosque in Tehran, Iran, Friday, Jan. 17, 2020. Iran's supreme leader said President Donald Trump is a "clown" who only pretends to support the Iranian people but will "push a poisonous dagger" into their backs, as he struck a defiant tone in his first Friday sermon in Tehran in eight years. (Office of the Iranian Supreme Leader via AP)

TEHRAN, Iran (AP) — Iran’s supreme leader lashed out at Western countries as he led Friday prayers in Tehran for the first time in eight years, dismissing “American clowns” who he said pretend to support the Iranian nation but want to stick their “poisoned dagger” into its back.

Ayatollah Ali Khamenei used his rare appearance at the weekly prayers to deliver a fiery address in which he insisted Iran would not bow to U.S. pressure after months of crushing sanctions and a series of recent crises — from the American killing of a top Iranian general to Iran’s accidental shootdown of a Ukrainian passenger plane.

Khamenei said the mass funerals for Gen. Qassem Soleimani, who was killed in a U.S. airstrike earlier this month, show that the Iranian people support the Islamic Republic despite its recent trials. He said the “cowardly” hit on Soleimani had taken out the most effective commander in the battle against the Islamic State group.

In response to Soleimani’s killing, Iran launched a barrage of ballistic missiles targeting U.S. troops in Iraq, without causing serious injuries. Khamenei said the strike dealt a “blow to America’s image” as a superpower. In the part of his sermon delivered in Arabic, he said the “real punishment” would be in forcing the U.S. to withdraw from the Middle East.

U.S. President Donald Trump later tweeted a sharp response to Khamenei: “The so-called ‘Supreme Leader’ of Iran, who has not been so Supreme lately, had some nasty things to say about the United States and Europe. Their economy is crashing, and their people are suffering. He should be very careful with his words!”

After the missile strike on Soleimani, as Iran’s Revolutionary Guard braced for an American counterattack that never came, it mistakenly shot down a Ukrainian jetliner shortly after takeoff from Tehran’s international airport, killing all 176 passengers on board, mostly Iranians.

Authorities concealed their role in the tragedy for three days, initially blaming the crash on a technical problem. When it came, their admission of responsibility triggered days of street protests, which security forces dispersed with live ammunition and tear gas.

Khamenei called the shootdown of the plane a “bitter accident” that he said had saddened Iran as much as it made its enemies happy. He said Iran’s enemies had seized on the crash to question the Islamic Republic, the Revolutionary Guard and the armed forces.

Ukraine’s foreign minister, Vadym Prystaiko, said Friday that his country wants Iran to issue a formal document admitting its guilt. Ukraine, Canada and other nations whose citizens died in the crash have demanded Iran pay compensation to the victims’ families.

The German airline Lufthansa, meanwhile, said its flights would continue to avoid Iranian airspace through March 28, citing the “continued unclear security situation.”

Khamenei also lashed out at Britain, France and Germany after they triggered a dispute mechanism to try and bring Iran back into compliance with the unraveling 2015 nuclear agreement. Iran began openly breaching certain limits under the agreement last summer, more than a year after President Donald Trump unilaterally withdrew from the deal and began imposing sanctions. After the killing of Soleimani, Iran said it was no longer bound by the nuclear deal.

“These contemptible governments are waiting to bring the Iranian nation to its knees,” Khamenei said. “America, who is your elder, your leader and your master, was not able to bring the Iranian nation to its knees. You are too small to bring the Iranian nation to its knees.”

Khamenei has held the country’s top office since 1989 and has the final say on all major decisions. The 80-year-old leader openly wept at the funeral of Soleimani and vowed “harsh retaliation” against the United States.

Thousands of people attended the Friday prayers, occasionally interrupting his speech by chanting “God is greatest!” and “Death to America!”

Tensions between Iran and the United States have steadily escalated since Trump withdrew from the nuclear accord, which had imposed restrictions on Iran’s nuclear program in exchange for the lifting of international sanctions.

The U.S. has since imposed crippling sanctions on Iran, including its vital oil and gas industry, pushing the country into an economic crisis that has ignited several waves of sporadic, leaderless protests. Trump has openly encouraged the protesters — even tweeting in Farsi — hoping that the protests and the sanctions will bring about fundamental change in a longtime adversary.

Khamenei mocked those efforts, dismissing “these American clowns who falsely and despicably say that they are standing with the Iranian people.” He did not refer to Trump by name, but was clearly referring to him and his administration.

“You are lying,” he said. “If you do stand with the Iranian people it is because you want to stick your poisoned dagger into the back of the Iranian nation. Of course you haven’t been able to do that so far, and you won’t be able to do a damn thing.”

Khamenei was always skeptical of the nuclear agreement, arguing that the United States could not be trusted. But he allowed President Hassan Rouhani, a relative moderate, to conclude the agreement with President Barack Obama. Since Trump’s withdrawal, he has repeatedly said there can be no negotiations with the United States.

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Khamenei last delivered a Friday sermon in February 2012, when he called Israel a “cancerous tumor” and vowed to support anyone confronting it. He also warned against any U.S. strikes on Iran over its nuclear program, saying the U.S. would be damaged “10 times over.”

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Krauss reported from Dubai, United Arab Emirates. Associated Press writer Bassem Mroue in Beirut contributed.