Donald Trump is expecting economic deals and a “wild” welcome this week in China. In reality, he’ll arrive facing an emboldened Xi Jinping, just as his own hand is constrained by the conflict in Iran.  When the US president touches down in Beijing on Wednesday evening for a 36-hour summit, it’ll mark his first overseas trip since waging war in the Middle East. Over talks at the Great Hall of the People and a state dinner, followed by morning tea, the leaders will discuss trade, tariffs and the s