> Putin wanted Trump to decapitate the Iranian regime?

This is impractical. There is a hierarchy of thousands of Mullahs that ascend when you kill off one. There is no "head". It's a distributed hierarchy or hydra, rather than an effective dictatorship. ofc, Trump wanted to appease Bibi and Trump fired most of the advisors who object to his bad ideas, so it was a perfect storm for a global quagmire.