Depends on the audience. It might have been intended to convince a certain Shiite theocracy that he is just as bat$hit crazy as they are and they’d best negotiate while they have something left to negotiate with.

I read a recent article that started out by saying the current government of Iran has never won a war but they’ve never lost a negotiation. Historically, there is an element of truth in that. There is a tendency on the part of sociopaths - and sociopathic societies - to believe they are the only sociopaths in existence. Disabusing them of that notion - before negotiating with them - is sometimes helpful.