In 1965, Congo established relations with the Soviet Union, the People's Republic of China, North Korea and North Vietnam. Massamba-Débat was unable to reconcile various institutional and ideological factions and his regime was ended abruptly with an August 1968 coup d'état. Marien Ngouabi, who had participated in the coup, assumed the presidency on December 31, 1968. One year later, President Ngouabi proclaimed Congo to be Africa's first "people's republic" and announced the decision of the National Revolutionary Movement to change its name to the Congolese Labour Party (PCT). On March 16, 1977, President Ngouabi was assassinated. An 11-member Military Committee of the Party (CMP) was named to head an interim government with Joachim Yhombi-Opango to serve as President of the Republic. Two years later, Yhombi-Opango was forced from power and Denis Sassou Nguesso become the new president.