United States President Donald Trump announced late Saturday that he has cancelled a planned large-scale military attack on Iran, citing the agreement on the "perimeters of a deal." The decision, made public on his Truth Social platform, came after days of escalating tensions and reports of imminent strikes.

Trump stated that his decision was a response to requests from Iran and other Middle East countries to "hold off any attack in that the perimeters of a deal has [sic] been agreed to." He indicated that the agreement, if concluded quickly, would lead to the "Immediate, Complete, and Total OPENING OF THE HORMUZ STRAIT" and address what he termed "Iran’s nuclear threat."

Earlier on Saturday, Iran's Foreign Minister Abbas Araghchi had communicated to his Saudi counterpart that any US or Israeli attack would be met with a "proportionate response." This exchange highlighted the volatile regional dynamics at play.

According to the US news site Axios, Saudi Crown Prince Mohammed bin Salman reportedly called Trump on Saturday, urging the president to reconsider the strikes and pursue negotiations. This call is said to have been a factor in Trump's decision to de-escalate.

The cancellation follows a period of heightened alert. On Friday, Trump had stated that the US would strike Iran "very hard." In response to these rising tensions, the US Department of State issued security alerts on Saturday for Americans in 10 countries across the region, advising increased caution and suggesting departure.

There was no immediate official response from Tehran to President Trump's announcement regarding the deal perimeters. The specifics of the agreement, beyond the opening of the Strait of Hormuz and addressing Iran's nuclear program, remain unclear.

This development occurs amidst a backdrop of complex diplomatic and military maneuvering in the Middle East. The Strait of Hormuz, a vital chokepoint for global oil transport, has been a focal point of contention, with Iran previously warning against any disruption.

Further details regarding the parties involved in the negotiations, the exact terms of the agreed-upon deal perimeters, and the timeline for its finalization are yet to be disclosed. The international community will be closely watching for subsequent developments and the full implications of this averted military action.