A day after saying the United States was "locked and loaded" to respond to the incident, Trump said on Monday there was "no rush" to do so.
Ayatollah Khamenei further elaborated on the United States' goals in pursuing the maximum pressure policy and at the same time, trying to lure Iran to the negotiating table, saying: The U.S. pursues a policy of maximum pressure on Iran through various embargoes, intimidation, and distorted claims, because the current U.S. government believes that the Islamic Republic can not be brought to its knees, humiliated, and made to submit, through any indirect approach. But Khamenei said any talks with the Americans would lead to the "imposition of their demands on Iran" and mean their policy of "maximum pressure" was a success.
The market eased from its peak after Trump said he would release USA emergency supplies and producers said there were enough stocks stored up worldwide to make up for the shortfall.
"If America changes its behaviour and returns to (Iran's 2015) nuclear deal, then it can join multilateral talks between Iran and other parties to the deal", Khamenei said. "We'll let you know, as soon as we find out definitively, we'll let you know", he said.
Several U.S. cabinet officials, including Secretary of State Mike Pompeo and U.S. Secretary of Energy Rick Perry, have blamed Tehran for the strikes.
He said: "All officials in Iran unanimously believe it".
Relations between Washington and Tehran have soured since Trump withdrew from the Iranian nuclear deal past year and reimposed sanctions over the country's nuclear and ballistic programs.
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That moment aside, the Trump administration has seemed willing-and eager, at times-to start a war with Iran.
The assault damaged the world's biggest crude oil processing plant, triggering the largest jump in oil prices in decades. We're dealing with Saudi Arabia. The US military, he said, was working with its partners to "address this unprecedented attack and defend the worldwide rules-based order that is being undermined by Iran".
"In return, we have to prove that the policy is not worth a penny for the Iranian nation", he continued.
The US and worldwide benchmarks for crude each vaulted more than 14%, comparable to the 14.5% spike in oil on August 6, 1990, following Iraq's invasion of Kuwait.
"The kingdom is capable of defending its land and people and responding forcefully to those attacks", the statement added.
King Salman, heading a cabinet meeting on Monday, said Riyadh would handle the consequences of "cowardly attacks" that target vital Saudi installations, world crude supplies and global economic stability. "But we would certainly help them".
Saudi Arabia urged United Nations experts to help investigate the raid.
Iran rejected the allegations, and a government spokesman said there now is "absolutely no chance" of a hoped-for meeting between Iranian President Hassan Rouhani and Trump at the UN General Assembly next week. Iran has repeatedly threatened that if it is prevented from selling its oil, other exporting countries will also suffer.
In the wake of an apparent drone attack targeting oilfields on the Arabian Peninsula, Congress should do everything it can to avoid getting America involved in a potential conflict between Iran and Saudi Arabia. Iran says there can be no talks until Washington lifts sanctions.