Kate Adie introduces dispatches from writers and correspondents around the world. This week: As the latest summit of the Group of 20 leading nations takes place in China this weekend, Carrie Gracie profiles the historic city of Hangzhou which will host the meetings of the heads of government and central bank governors. Wyre Davies considers the vote of the Brazilian Senate to impeach Dilma Rousseff and whether the change at the top of the country's politics amounts to a coup. Katerina Vittozzi reports from the Central African Republic on her meeting with the victim of a brutal sexual assault. With Pyongyang holding its first international beer festival, Stephen Evans considers how the drink is a surprisingly unifying facet of life in North and South Korea. And David Willis in Los Angeles ponders whether errant American Olympian, Ryan Lochte, may yet be rehabilitated by dancing with the stars.