In 2015 the western world had a plan to stop Iran from building a nuclear bomb and bring them in from the cold.
Make peace type of thing.
Unfortunately because this was done by Obama in triggered a lot of people. Particularly Trump. Then when he became president he deiced to erase anything obama did. One of those things was the Iran deal. Europe still want the deal. Its only America or rather Trump that doesn't.
The problem is is there doesn't seem to be a plan. 2 months ago he was saying the literal opposite of what he has done today. He even got someone to fire Bolton. The person screaming in Trumps ear to do this.
Its irrational behaviour as usual but this time it could affect more people in the world.