After fighting a trade war with the United States for more than a year, Chinese officials have long realised that the best precaution against Donald Trump’s presidency of wilful unpredictability is to liken it to a natural disaster. While it is hard to predict when or how a disaster strikes, one should think of all possible ways to prepare for the worst and mitigate risks in case it happens.As a result, few would have been surprised when Trump once again ramped up trade tensions with China and…