(23.7.2018) President Donald Trump’s heated exchange of threats with Iran’s leaders this week is raising questions about whether the world has seen this show before — and whether it will end the same way.

Is it possible, as he did with North Korea, that Trump will ramp up sanctions and rhetorical pressure on Tehran, only to eventually back off, reach a deal of little substance with the country’s leaders and declare, implausibly, that he solved a decades-old problem?