After the coup d'état in March 1962, the Revolutionary Council led by General Ne Win dissolved all political parties and other institutions of parliamentary democracy. Kyaw Nyein was detained in August 1963 and released in 1968 at the height of tensions between Burma and China and an escalating civil war between Burma's armed forces and the China-backed Burma Communist Party. In the same year, he and other veteran politicians among them U Nu and U Ba Swe were invited by General Ne Win to advise the Revolutionary Council on drafting a national constitution and "ways of improving the country's stability and prosperity." He was part of a group of twenty-one politicians who proposed the return to democracy with a mixed economy. A minority of eleven from a total of thirty-three members of the advisory committee recommended a one-party system. Ne Win rejected the majority advice. In 1974, Ne Win established a Soviet-style one-party socialist system based on a new constitution