What do we know of the US's 15-point peace plan sent to Iran?

Donald Trump says he has a 15-point plan that has been offered to Iran to bring an end to the war. But details remain vague and Trump's claims of progress in talks have been dismissed by Tehran. The US is hoping that talks hosted by Pakistan will be able to facilitate a settlement. But Washington is still keeping its military options open, with US media reporting that at least 3,000 airborne troops would be deployed to the region in the coming days.