Iran has thrown Trump's ultimatum and Saturday deadline right back at Washington, saying that instead it is the United States that must first meet the agreed-upon conditions in order to normalize shipping and energy transit in the Strait of Hormuz.

Fars news agency reports Saturday that Iranian leadership is demanding that the US implement "agreed-upon understandings" before any talks take place. While the White House has declared the ceasefire to be 'over' - it has also indicated ongoing contacts and talks with Iran via mediators. But this appears to have been reduced to simple ultimatums being shuttled between capitals by Qatari mediators. There are no actual sit-down talks on the horizon after two rounds of fresh tit-for-tat attacks broke out this past week.

The memorandum of understanding (MoU) itself is barely alive at this point, also with Iran's ambassador to the United Nations, Amir-Saeid Iravani, separately announcing that Tehran could stop honoring the MoU if US attacks continue. 

"Should the United States continue to violate its obligations under the MoU, Iran will no longer be bound to fulfil its obligations under the MoU," Iravani told reporters at UN headquarters.

But he did make clear that Iran is still committed to the agreement "provided that the United States fully and faithfully complies with its own obligations."

President Trump has meanwhile continued to issue his own warnings and threats. He said Friday that the US military would "completely decimate" Iran if its leaders attempted or carried out his assassination. He took it a step further in an overnight Truth Social Post, saying he has 1,000 missiles "locked and loaded" - aimed at Iran - should he be targeted by Tehran's agents.

Strangely, the US President signed off with his puzzling "praise be to Allah!" reference - perhaps mockingly or sarcastically.

Meanwhile, Supreme Leader Mojtaba Khamenei still hasn't been seen in public after the Feb.28 US-Israeli airstrikes took out his father, killed members of his family, and reportedly badly wounded him. Mojtaba is said to be observing a private memorial for his slain father, and made no known appearance at the week-long funeral processions and burial.

But on Saturday he did call for revenge in a rare public message. "It is our certain and undeniable duty that this revenge be carried out," he said.

"We pledge to avenge your pure blood and the blood of all the martyrs of these two [recent] wars by taking revenge against the criminal, disgraceful murderers," the Ayatollah also stated. "This vengeance is what our nation is demanding, and this must definitely be done."

He issued a series of statements tinged with Shia Islamic references. His words contain repeat vows to enacting vengeance, including this not so veiled threat to kill Iran's enemies: 

As for the big picture of where things stand, University of Chicago political scientist Robert Pape, who authors "The Escalation Trap," has pointed out that that the millions of Iranians who took to the streets last week to attend the late Ayatollah's funeral demonstrate growing nationalist resolve. He explained that this only makes further escalation more likely later this summer, as public sentiment gets hardened against the US.

"The balance of military capabilities did not change over the weekend," Pape said. "The balance of political will shifted."

Referencing the now unraveling ceasefire and negotiations process, Pape is predicting: "The pause appears to be another stage in the escalation process rather than the beginning of de-escalation."