Pro-Tibet demonstrators wave flags in support of Tibet as they protest outside of Buckingham Palace, in central London, on October 20, 2015, where the Chinese president is being hosted by Britain's Queen Elizabeth II, on the first official day of a state visit. President Xi Jinping arrived for a four-day state visit as the government of Prime Minister David Cameron seeks stronger trade ties with the world's second-largest economy. AFP PHOTO / JACK TAYLOR (Photo credit should read JACK TAYLOR/AFP/Getty Images)
