By Andreas Kluth

Credibility, like trust and a good reputation, is hard to earn, easy to lose. It’s also ruinously expensive once it’s gone, especially in international relations. So it is no small matter that Donald Trump, eight months into his second term as US president, has squandered whatever credibility America had left in foreign and security policy.

The latest embarrassments occurred last week, when Trump fired off several zingers on the same day, causing world leaders to be by turns shocked, puzzled or — most devastatingly — indifferent verging on bemused. In a rambling speech at the United Nations, Trump offended not only that institution but also individual countries from Brazil to Britain. Later, he ad-libbed his latest reversal on the Russian war of aggression against Ukrain

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