We’re at the Nato summit in The Hague where Europe’s leaders were hoping to put defence spending and Ukraine top of the agenda.

That's before Donald Trump derailed things by swearing on the White House lawn. He’s very cross that Israel and Iran aren't listening to him, and his insistence that a ceasefire is underway.

Can he will a war to end just by saying it? Or are we learning how little control Trump really has over world events?

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