Head of state
Single-party states

In certain states under Marxist–Leninist constitutions of the constitutionally socialist state type inspired by the former Union of Soviet Socialist Republics (USSR) and its constitutive Soviet republics, real political power belonged to the sole legal party. In these states, there was no formal office of head of state, but rather the leader of the legislative branch was considered to be the closest common equivalent of a head of state as a natural person. In the Soviet Union this position carried such titles as Chairman of the Central Executive Committee of the USSR; Chairman of the Presidium of the Supreme Soviet; and in the case of the Soviet Russia Chairman of the Central Executive Committee of the All-Russian Congress of Soviets (pre-1922), and Chairman of the Bureau of the Central Committee of the Russian SFSR (1956–1966). This position may or may not have been held by the de facto Soviet leader at the moment. For example, Nikita Khrushchev never headed the Supreme Soviet but was First Secretary of the Central Committee of the Communist Party (party leader) and Chairman of the Council of Ministers (head of government).

This may even lead to an institutional variability, as in North Korea, where, after the presidency of party leader Kim Il Sung, the office was vacant for years. The late president was granted the posthumous title (akin to some ancient Far Eastern traditions to give posthumous names and titles to royalty) of " Eternal President ". All substantive power, as party leader, itself not formally created for four years, was inherited by his son Kim Jong Il. The post of president was formally replaced on 5 September 1998, for ceremonial purposes, by the office of President of the Presidium of the Supreme People's Assembly, while the party leader's post as chairman of the National Defense Commission was simultaneously declared "the highest post of the state", not unlike Deng Xiaoping earlier in the People's Republic of China.

In China, under the current country's constitution, the Chinese President is a largely ceremonial office with limited power. However, since 1993, as a matter of convention, the presidency has been held simultaneously by the General Secretary of the Chinese Communist Party, the top leader in the one party system. The presidency is officially regarded as an institution of the state rather than an administrative post; theoretically, the President serves at the pleasure of the National People's Congress, the legislature, and is not legally vested to take executive action on its own prerogative.
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