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That's a really good point, yes. Trump's focus in essentially any speech he holds is on the mistakes of his political opponents or on things that he could twist such that they look like a mistake to his followers. He really is a verbal acrobat and I watched him holding a speech just yesterday. Quintessence of the speech was: without him there would not be a single war on the whole planet right now. But all wars there are these days are the result of Biden's political decisions.

But he also often leaves the political arena and pulls as many private issues into it as possible. Ad hominem attacks are one of his major rhetorical devices.
I don't know how serious Trump is when he talk about himself as a kind of global peace maker which would end all those conflicts easily. I doubt he is talking without knowing anything about geopolitics, because he was president of his country after all.
It is quite a interesting thing if you pay attention, he has mixed his propaganda of America First, but at the same time he has managed to continue to talk about conflicts from all around the globe. If he talks about making peace, then it is still a sort of USA mediation or interference.
Economically he wants to keep USA in his priorities, but politically he is similar enough to his predecessors in the White House. They may even have a quite similar definition on what peace is.
That is how I see it, too. But Trump knows that there are many actors in the world who give a damn about what Trump says and whether he wants war or not. It is not like everyone around the globe is listening to him and then making a decision whether to initiate a war or not. That may be the case for some countries, but certainly not for all. It is so easy for him to now claim that there wouldn't be war in the Ukraine if he was the president. But you know, Trump is turning every single piece of the presence upside down and claims it would be better with him. I can't even remember if he ever said he would have done the same because what someone else did was good. Narcissism.
Yes, Narcissism. I do not how much of it, but obviously it is more narcissism than any president of the United States is supposed to have, so they can direct their republic to a good future.
If you asked me, Trump with his peace-making speech is not only trying to appeal to people living in other countries or leaders of other nations, the way he uses this speech is order to try tk convince those who are not in favor of using tax money to fund wars, while at home there are people do cannot afford to pay for shelter and suffer in the winters, or those who cannot afford some medicine to take care of themselves.
It is a left wing speech, but twisted to bring people to vote for a man who obviously has nothing to do with left wing policies. It is a good strategy, and will stay as an strategy, since it is obvious Trump won't use that funding to pay for medicine, though.