epa08082673 Chinese and Macao&#039;s flags wave during the flag-raising ceremony for Macao Special Administrative Region&#039;s (SAR) 20th anniversary at Lotus Flower Square in Macao, China, 20 December 2019. Macao had been a Portuguese colony until 1999 when it returned to Chinese rule under the &#039;one country, two systems&#039; principle.  EPA/JOAO RELVAS