The Constitution of Nepal, adopted in 2015, affirms Nepal as a secular federal parliamentary republic divided into seven provinces. It remains the only multi-party, fully democratic nation in the world currently ruled by a communist party. Nepal was admitted to the United Nations in 1955, and friendship treaties were signed with India in 1950 and China in 1960. Nepal hosts the permanent secretariat of the South Asian Association for Regional Cooperation (SAARC), of which it is a founding member. Nepal is also a member of the Non-Aligned Movement and the Bay of Bengal Initiative. The Nepalese Armed Forces are the fifth-largest in South Asia; and are notable for their Gurkha history, particularly during the world wars, and has been a significant contributor to United Nations peacekeeping operations.