South Korea selected Gangjeong, a small fishing town on the island's southern coast, as the site for its naval base in 2007 when Moon was chief of staff for liberal President Roh Moo-hyun.
|South Korean President Moon Jae-in (Yonhap)|
The project touched off angry protests from village residents and activists on the ground that the base could set off a regional arms race and damage the island's environment. The construction of the Jeju base was completed in 2016.
On Thursday, Moon offered consolation to residents in Gangjeong as he met them in the village after attending an international fleet review that took place in waters off Jeju.
"There should be procedural and democratic legitimacy even in a matter of national security, but it was not the case," Moon said.
He also called for efforts to reconcile and heal the wounds of Gangjeong Village, noting the local community had collapsed due to deep divisions over the project.
Last year, the South Korean government dropped a lawsuit against residents of Jeju Island and activists for having obstructed the construction of the naval base in what it called a decision to promote national unity.
In March 2016, the Navy filed the suit with the Seoul Central District Court to exercise its right to indemnity against 116 individuals and five entities, citing losses of 3.45 billion won in taxpayer money from a delay in the construction work. (Yonhap)