Iran's Islamic Revolutionary Guard Corps commander in chief said on Wednesday that his fighters were ready to respond if Israel escalates again, as a fragile ceasefire continues to hold.

"We have never and will never trust this savage enemy. All our fighters have their fingers on the trigger. If the enemy makes a mistake, we will certainly respond with the same courageous defense as we did during the past twelve days. We will never hesitate for a moment in defending this country," Mohammad Pakpour, IRGC commander-in-chief, said.

Mossad Chief David Barnea on Wednesday thanked the CIA for its help in Israel's operations in Iran, saying the Israeli intelligence agency is continuing to keep a "close eye" on Iran.

"I want to express appreciation and gratitude to our central partner, the CIA, for the joint activity, for the operations that came to light. Also to the head of the CIA who supported the Mossad and for bringing forward the right decisions that ultimately made this operation possible," he said.

"We will continue to keep a close eye on all the projects in Iran that we know very well. We will be there [in Iran], as we have been there until now," Barnea noted.

-ABC News' Dana Savir and Will Gretsky

Iran said its nuclear installations were "badly damaged" because it "has come under repeated attacks by Israeli and American aggressors," Esmail Baghaei, Iran’s Foreign Ministry spokesperson, said on Wednesday.

"There has been a draft bill by our parliament today. It has been adopted. And it talks about suspending our cooperation with the IAEA [International Atomic Energy Agency]. It talks about suspending. Not putting an end to the cooperation," he said.

"Based on the parliament bill, the IAEA staff are not entitled to enter Iran for inspections, unless security of the nuclear facilities and peaceful activity of Iran is guaranteed," Baghaei noted.

Iran criticized the IAEA, with Baghaei saying the least it "had to do was to explicitly condemn the acts by the U.S. and Israel."

"The international community has to understand that what was done by the United States against Iran was a horrible blow to international diplomacy, to international law and to international ethics," he said.

"After we launched an attack in our defense on the U.S. base in Qatar -- that is the al-Hudeid base -- we received a message from Oman regarding ceasefire. As a country that has never welcomed war, and never doubted in defending ourselves, we accepted this suggestion," Baghaei said.

President Donald Trump said he doesn't envision Iran getting back into the "nuclear business" anymore.

Despite reports that intelligence found that U.S. strikes on Iran did not completely destroy the country's nuclear program and only set back its the nuclear program by months, Trump has insisted otherwise on Wednesday.

"The site was obliterated just like I said it was," Trump said during a press conference at the NATO Summit on Wednesday.

"Issue the report when you know what happened," Trump said. "The report was not a complete report."