2.3 - Executive Systems
Every government has executive institutions that formulate, implement, and enforce policy, including chief executives, cabinets, bureaucracies, and specialized agencies. But titles, powers, structures, and functions vary a lot across the six course countries depending on regime type and political tradition.
A few terms come up for every country. The head of state is the symbolic leader who represents the country, greeting foreign leaders, signing laws, and formally appointing officials. The head of government actually runs the government day to day and directs policy. Some countries split these jobs (the UK's monarch and prime minister, Russia's president and prime minister), while others give both to one person (the presidents of Mexico and Nigeria). The cabinet is the group of top ministers who each lead a major department, and the civil service (the bureaucracy) is the large staff of career officials below them. Together, chief executives and cabinets formulate policy (decide what to do), implement it through ministries and agencies, and enforce it through regulators, inspectors, and police.
China: Dual Party-State Executive
China's executive power is concentrated in the Communist Party leadership, with the same individuals holding formal state positions.
The President holds several interlocking roles at once: Commander in Chief of the armed forces, Chair of the Central Military Commission (commanding the People's Liberation Army through the party), and General Secretary of the Chinese Communist Party, which is actually the most powerful of the three. The National People's Congress formally elects the president, but in reality the party leadership decides who serves. Xi Jinping has held all three positions since 2012 to 2013, and constitutional amendments in 2018 removed presidential term limits, allowing indefinite tenure.
The Premier heads the government day to day, nominated by the president and confirmed (essentially rubber-stamped) by the NPC. The premier oversees the civil service and the State Council (cabinet) and handles economic policy implementation, but ranks below the president in the power hierarchy. Li Keqiang served as premier from 2013 to 2023, but Xi's dominance meant Li largely executed Xi's directives rather than setting policy independently.
As of 2026, the premier is Li Qiang, a longtime Xi ally who took over from Li Keqiang in March 2023. That same month the NPC gave Xi a third term as president, five months after he began a third five-year term as General Secretary in October 2022, breaking the two-term pattern his predecessors followed.
Leadership changes happen behind closed doors within the Communist Party: elite negotiate succession privately, there's no public campaigning or competitive election, decisions get made in the Central Committee and Politburo, and the NPC then formally "elects" whoever was predetermined. Xi's own rise happened this way in 2012 to 2013, and his elimination of term limits was decided by the party before it was formally written into the constitution.
Iran: Theocratic Dual Executive
Iran has two executives: the Supreme Leader, who holds religious authority, and the President, an elected official, with the Supreme Leader holding ultimate power.
The Supreme Leader is Iran's most powerful position and serves for life. The Assembly of Experts, a body of 88 elected clerics, chooses the Supreme Leader, who then sets the political agenda, serves as Commander in Chief of the armed forces and Revolutionary Guards, appoints top ministers, the head of the judiciary, and key bodies like the Expediency Council and half the Guardian Council, and can veto elected institutions. The constitution requires the Supreme Leader to be a Shia cleric who is an expert in Islamic law. Ayatollah Ali Khamenei held the post from 1989 until he was killed in a US and Israeli airstrike on February 28, 2026, and he made the final call on things like nuclear negotiations and national security, even when elected presidents proposed different policies. His succession happened behind closed doors: a temporary council (the president, the head of the judiciary, and a Guardian Council cleric, as the constitution requires) held his powers for about a week, and then the Assembly of Experts chose his son, Mojtaba Khamenei, as Supreme Leader in March 2026. As of 2026, he is Iran's Supreme Leader. Critics called a son succeeding his father a step toward hereditary rule, the kind of rule the 1979 revolution overthrew.
The President is elected but subordinate to the Supreme Leader, chosen through direct popular vote for a four-year term with a two-term limit. The president oversees the civil service and ministries, conducts foreign policy implementation, and proposes budgets and legislation, but must be approved by the Guardian Council just to run, and major decisions still require Supreme Leader approval. President Hassan Rouhani (2013 to 2021) negotiated the nuclear deal, but its implementation needed Khamenei's sign-off. Presidents who have Supreme Leader support can wield real authority, while those who challenge the Supreme Leader find their power sharply limited.
Iran's limit is on consecutive terms, so a former president can run again after sitting out a term (Akbar Hashemi Rafsanjani, president from 1989 to 1997, ran again in 2005 and lost). As of 2026, the president is Masoud Pezeshkian, a reformist who won a July 2024 runoff after President Ebrahim Raisi died in a helicopter crash.
Mexico: Strong Presidential System
Mexico has a presidential system with traditionally powerful executive authority, though recent reforms have added more constraints.
The President serves as both head of state and head of government, elected by direct popular vote for a single six-year term (sexenio) with no reelection ever allowed. The president is Commander in Chief, heads the bureaucracy and all ministries, can sign or veto legislation, appoints most of the cabinet without legislative confirmation, and conducts foreign policy. Historically the office has been very strong with limited checks, though multiparty competition has constrained presidential dominance since the late 1990s. AMLO (2018 to 2024) exercised strong executive authority, implementing major projects like the Tren Maya railway largely through executive action, though he faced more congressional resistance than PRI presidents once did. As of 2026, the president is Claudia Sheinbaum of Morena, Mexico's first woman president, in office since October 1, 2024. With Morena and its allies holding two-thirds of Congress, she has faced fewer congressional checks than recent presidents, though her 2026 electoral reform still failed when allied parties voted against it.
Since presidents serve just one six-year term with no reelection, there's complete turnover of leadership every sexenio, with a new president typically replacing the entire cabinet and many bureaucrats, which creates some policy discontinuity.
Nigeria: Federal Presidential System
Nigeria's presidential system is modeled on the US, with separation of powers. The President serves as both head of state and head of government, elected by direct popular vote requiring a plurality plus 25% support in at least two-thirds of the states, serving a four-year term renewable once. The president is chief executive, Commander in Chief, heads the civil service, can assent to or veto bills, conducts foreign policy, and nominates ministers subject to Senate confirmation.
There are real constraints too: the National Assembly can override vetoes, the Senate must confirm cabinet appointments, impeachment is possible with a two-thirds vote, the federal structure limits authority over the states, and judicial review checks executive action. Buhari (2015 to 2023) faced significant National Assembly resistance on budgets and appointments, and legislative opposition forced him to negotiate on policy priorities. Since 1999, Nigeria has had regular presidential elections every four years with a two-term limit, and it's seen peaceful transfers of power including between parties in 2015, which has strengthened democratic institutions.
As of 2026, the president is Bola Tinubu of the All Progressives Congress (APC), who won the February 2023 election and took office on May 29, 2023. The next presidential election is scheduled for January 16, 2027.
Russia: Dominant Presidential System
Russia's semi-presidential system concentrates overwhelming power in the presidency despite technically having a separate prime minister. The President serves as head of state and de facto runs the government (since 2020 the constitution says the government works under the president's "general leadership"), elected by direct popular vote for a six-year term. The president is Commander in Chief, appoints top ministers including the prime minister (subject to Duma approval), appoints the ministers in charge of defense, foreign affairs, and security himself, conducts foreign policy, and issues decrees with the force of law. The CED also says the president "presides over the Duma under certain conditions." The president doesn't chair Duma sessions (the Duma elects its own chairman), so the real power behind this phrase is control over the Duma's survival: the president can dissolve it and call new elections if it rejects his choice for prime minister three times or votes no confidence in the government twice within three months. The president can also fire regional governors and name acting ones (governors have been elected again since 2012, but Kremlin-backed candidates almost always win).
In practice the president dominates completely, and United Russia's legislative majority ensures presidential proposals pass. Putin has dominated as president from 2000 to 2008 and 2012 to present, and as prime minister from 2008 to 2012 while his protégé Medvedev served as president. Until 2020 the constitution allowed two consecutive terms, which is why Putin stepped aside in 2008 and returned in 2012 (the term also grew from four to six years starting in 2012). Constitutional amendments in 2020 changed the rule to two terms total but reset Putin's count to zero, so he won a fifth term in March 2024 (officially with about 87% of the vote, against no real opposition) and could serve until 2036.
The Prime Minister heads the government day to day but is subordinate to the president, nominated by the president and confirmed by the Duma, overseeing the civil service and implementing presidential priorities. Mikhail Mishustin (2020 to present) manages bureaucracy and economic policy, but within parameters Putin sets. Presidential elections happen, but electoral manipulation, opposition suppression, and media control ensure the preferred outcome each time, so leadership change is controlled rather than genuinely competitive.
United Kingdom: Parliamentary Executive
The UK's parliamentary system features a ceremonial monarch and a powerful prime minister. The Monarch serves ceremonially as head of state through hereditary succession, formally appointing the Prime Minister (though with no actual choice, since it's whoever commands a Commons majority) and signing legislation into law without the ability to refuse. King Charles III succeeded Queen Elizabeth II in 2022, and while he formally appoints the PM and opens Parliament, these are purely ceremonial acts.
The Prime Minister is the most powerful position and the de facto head of government and chief executive, selected as the leader of the party or coalition holding the most Commons seats, with no fixed term limits, serving as long as they maintain parliamentary confidence. The PM can call an election at any time by asking the monarch to dissolve Parliament (the Fixed-term Parliaments Act took this power away from 2011 to 2022, and the Dissolution and Calling of Parliament Act 2022 gave it back), sets the foreign policy agenda, functions as de facto Commander in Chief, heads the civil service and all government departments, appoints the cabinet, and sets the legislative agenda.
The PM must maintain Commons confidence though, the cabinet can pressure them to resign, the party can remove its own leader, and there's electoral accountability. Rishi Sunak became PM in October 2022 after Liz Truss resigned under pressure from her own MPs after about seven weeks in office, serving without a general election at first because the Conservatives held a Commons majority. Labour's Keir Starmer then won the July 2024 general election, and in 2026 pressure from his own MPs pushed him out too, so as of 2026 the PM is Labour's Andy Burnham, in office since July 20, 2026. PMs change through elections or internal party processes, and leadership can shift rapidly if parliamentary confidence is lost, unlike fixed-term presidential systems.
Comparative Observations
Term lengths vary widely: China's president has had no limit since 2018, Iran's Supreme Leader serves for life, Iran's president gets two consecutive four-year terms (and can run again after a break), Mexico's president gets six years with no reelection, Nigeria's president is capped at eight years, Russia's president gets two six-year terms in total (with Putin's earlier terms not counted, so he could serve until 2036), and the UK's PM has no term limit while they maintain confidence.
Selection methods differ too: direct election (Mexico, Nigeria, Russia, Iran's president), party or legislative selection (UK, China's premier), elite religious selection (Iran's Supreme Leader), and hereditary succession (the UK monarch).
Power concentration is highest in China (party control) and Russia (presidential dominance), divided in Iran (Supreme Leader versus president), and more constrained in Nigeria (separation of powers) and the UK (parliamentary accountability), with Mexico's presidency strong but term-limited.
Change processes range from transparent and regular (Nigeria, Mexico) to party-determined (UK, China) to controlled or manipulated (Russia) to mixed (Iran, where the Supreme Leader's process is opaque but the president is elected).