Iran's rulers are confronting their most serious challenge since their own 1979 revolution.
They're now countering on an unprecedented scale - a ferocious security crackdown and near total internet shutdown has been unleashed on a scale unseen in previous crises.
Some of the streets once engulfed by a roar of anger against the regime are now starting to go silent.
On Friday it was extremely crowded - the crowd was unbelievable - and there was a lot of shooting. Then Saturday night it became much, much quieter, a resident of Tehran told BBC Persian.
You would have to have a death wish to go out now, one Iranian journalist reflected.
This time, an internal upheaval is also compounded by an external threat, with President Trump's repeated warnings of military action coming seven months after the U.S. carried out strikes on key nuclear facilities during a 12-day war between Iran and Israel, which left the regime weakened.
Trump now says Tehran has called to go back to the negotiating table, but Iran doesn't have a good hand: Trump has warned of potential actions prior to any meetings, leaving unrest unresolved.
And Iran won't capitulate to US demands, including zero nuclear enrichment, crossing critical red lines in its strategic doctrine.
However, despite external pressures, there's no indication Iran's leaders plan to change course.
Their inclination is to clamp down, to try to survive this moment, and then to figure out where they go from here, explains Vali Nasr from the Johns Hopkins School of Advanced International Studies.
This week may determine how these protests affect Iran and the broader region, whether through military intervention or sustained unrest.
Iran's Foreign Minister asserted that the situation is now under total control, while reports of high casualties and overwhelming medical situations continue to emerge from hospitals.
After weeks of clashes, the Iranian regime has resorted to intensified repression, blaming foreign enemies for the unrest and preparing for hardline responses against perceived traitors.
Socio-political dynamics in Iran remain tense, with questions about the potential for reform or further instability looming as Western nations keep a watchful eye on Iran's internal strife.
