Donald Trump’s threat to blockade the Strait of Hormuz “forces Beijing into a political dilemma” and could potentially derail the US president’s coming summit with Chinese counterpart Xi Jinping, analysts said. After talks in Pakistan between the US and Iran ended without a deal on Sunday, Trump said in a social media post that the US would seal off the strategically vital chokepoint. In a narrower order issued later, the US military said American forces would blockade only “maritime traffic...