Trump reset the Obama Grand Bargain with the Mullahs by taking out Soleimani and staring down threats of retaliation
More fine analysis from
Prof. Jacobson at Legal Insurrection:
"The Obama administration tried to set the arc of history towards the medieval Mullah dealth cult, handing Iran the Middle East in exchange for nuclear compromises. Trump taking out Soleimani and staring down threats of retaliation, just bent that arc. Whether that bend ends up breaking Iranian regional expansion remains to be seen."