The sweeping victory for the ruling Democratic Party (DP) in the June 3 local elections could allow the current administration to pursue shifts in foreign as well as economic policies that could impact the Republic of Korea’s relations with its allies and partners, including the United States.

Local elections usually focus on issues close to home, but with a near supermajority in the National Assembly, President Lee Jae-myung will have far greater mandate to pursue ambitious external agendas that would otherwise require more compromise. On inter-Korean relations, the administration could face weakened domestic opposition to its “peaceful two-state” framework and resumption of government contacts, marking a departure from conservative stances. Similarly, Seoul could more overtly recalibrate toward a friendlier China policy.

At the same time, the conservative People’s Power Party (PPP) is in paralysis. Following the December 2024 declaration of martial law and former President Yoon Suk-yeol’s impeachment, the PPP has refused to cleanly sever ties with Yoon, arguably alienating moderates and leaving the party deeply fractured and unpopular. Unless the election defeat forces the PPP to undertake a genuine center-right realignment, it will likely fail to serve as an institutional counterweight on foreign policy. At the same time, the centrist Seoul mayor Oh Se-hoon’s reelection and the concurrent National Assembly by-election victory by former PPP leader Han Dong-hoon, a reformist heavyweight and a vocal critic of the Lee administration’s foreign policy, could give conservatives an influential voice.

With the conservative opposition effectively sidelined, critical foreign policy debates have shifted inward, exposing a fault line within the DP. This tension pits the “alliance faction” (dongmaeng-pa), which prioritizes US-ROK security ties, against the “autonomy faction” (jaju-pa), which advocates for a more independent posture on inter-Korean affairs and China. National Security Advisor Wi Sung-lac embodies the alliance-oriented approach. Unification Minister Chung Dong-young, who has repeatedly called for a warmer approach to North Korea and suspension of US-ROK military exercises, leads the autonomy faction. Political momentum granted by the landslide victory in regional elections could incentivize the autonomy faction to more aggressively push for inter-Korean agendas and accommodation of China. This dynamic in turn could potentially sour relations with the US, as Washington seeks to enlist Seoul’s support in countering China.

Tensions between the Blue House and the DP leadership add a twist to this situation. It has long been speculated that President Lee and DP Chairman Jung Chung-rae are wrestling for influence within the progressives, largely on domestic issues but potentially on the foreign policy front as well. Jung frequently champions the autonomy faction, leveraging party committees to encourage the administration toward friendlier relations with China and inter-Korean engagement. President Lee operates as the balancer between these two camps. Lee allows these factions to openly compete, ultimately adopting what best ensures his own political survival. The regional election result could shape DP leadership race scheduled in August—where Prime Minister Kim Min-seok, a Lee loyalist (“pro-Myung”), is expected to run against the incumbent Jung—with implications for foreign policy.

The June 2026 elections have created a political environment characterized by an unusually high concentration of power within the ruling party. While this dominance offers the Lee administration rare opportunities for strategic redirection and pursuit of inter-Korean engagement, it introduces risks of executive overreach and the subordination of national strategy to internal DP factional rivalries.

Image credit: Election officials count the ballots for local elections in Seoul, South Korea, June 3, 2026. REUTERS/Kim Hong-Ji