Davos, Switzerland — With Donald Trump back as US president with his confrontational style, Chinese, European and Ukrainian leaders are expected to defend global cooperation on Tuesday at the annual gathering of the world’s elites in Davos. There will no doubt be a Trump-sized elephant in the rooms at the World Economic Forum (WEF) in the Swiss Alpine resort. even if some leaders avoid saying his name — although the man will speak himself by video link on Thursday. Trump returned to the White House on Monday, bringing with him a more protectionist administration and fears he will deliver on