The Iranian foreign minister ruled out negotiations yesterday until Israel stopped attacking Iran. It was on BBC news.
Trump took that as a signal to attack, as expected from their home base in the US, Iran responded with a heavy missile attack on Israel damage will probably be heavy but that’s was what Netenyahu was expecting.
What happens next depends on Iran, if it attacks US bases and ships it will face the full force of US and Israeli power, in addition the US will try to target Khomeni and anyone else of significance. Given the success of Israeli targeting individuals they will probably succeed, Iran is hopelessly overwhelmed in firepower with no allies capable of helping significantly.
There will be a brief period of attacks, maybe Iran will try to close the Gulf but cannot sustain a long war and will be reduced to small arms very quickly. My bet is on a military takeover in Iran fairly quickly