Little problem there.

They have actually offered/threatened to deal with IR in the past. The US prefers that, as hot it as it is over there, that the temperature remains below Five Million Celsius.

I don't know what trumps motive to do this was, and my guesses would not be charitable, but it is at least possible that IL felt existentially froggy and was threatening to take matters into their own hands. If that turns out to be the case, then trump did the right thing. Better some prime-time CSAR drama and an oil price spike, than nukes popping off.

The nuclear genie isn't sealed in his bottle, but he's kind of hiding in the neck. Once he gets out again, we'll probably be in a new era for geopolitics and security. There many different ways that could go down, but I suspect most of them are bad (compared to the current status quo).