The PRC has diplomatic relations with 175 countries and maintains embassies in 162. In 2019, China had the largest diplomatic network in the world. Its legitimacy is disputed by the Republic of China and a few other countries; it is thus the largest and most populous state with limited recognition, with a population of more than 1.4 billion. In 1971, the PRC replaced the Republic of China as the sole representative of China in the United Nations and as one of the five permanent members of the United Nations Security Council. China was also a former member and leader of the Non-Aligned Movement, and still considers itself an advocate for developing countries. Along with Brazil, Russia, India and South Africa, China is a member of the BRICS group of emerging major economies and hosted the group's third official summit at Sanya, Hainan in April 2011.