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The Islamic Republic's leadership may calculate that Donald Trump's only real objection to the Iran nuclear deal was that his predecessor claimed the credit for it.
South Korea’s president has to negotiate the competing demands of Trump, Kim Jong-un and China.
He has antagonised the EU and insulted Theresa May – while cosying up to Putin and Kim. But the US president’s threats can’t simply be ignored.
Assassination attempts, cyber-attacks, military interventions – Russia is once again playing a deadly game with the West. Yet beneath the bravado is a nation riddled with insecurities.
Evidence of actual craziness might help win a game of chicken, but at the risk of the driver going over the brink.
The co-author of Tony Blair's Chicago speech on the tests for intervention.