Leaders from around the world congratulated newly sworn-in US President Joe Biden and Vice-President Kamala Harris, expressing cautious optimism over future relations after four years of tumult under Donald Trump.Biden’s first call to a foreign leader will be to Canadian Prime Minister Justin Trudeau on Friday.Trudeau, who butted heads with Trump over trade, said that “Canada and the United States enjoy one of the most unique relationships in the world”.He said he looked forward to working with…

This post was originally published on South China Morning Post.