China’s state media has lambasted Donald Trump for conducting foreign policy through Twitter, in a commentary reflecting Beijing’s frustration with the US president-elect’s unorthodox style of diplomacy after his tweets broached sensitive issues in Sino-US relations. State-run news agency Xinhua published the article, headlined “Addiction to Twitter diplomacy is unwise”, late on Tuesday night, hours after Trump’s tweet accusing China of refusing to help the United States contain North Korea’s nuclear ambitions.