Their talks came amid efforts to improve ties between the two neighboring countries and strengthen cooperation across defense and other sectors.
Koizumi's visit also follows Ahn's trip to Tokyo in January this year, after the two met multiple times in recent months on the sidelines of international gatherings and other occasions.
Koizumi, who arrived in Seoul the previous day, toured an air base in Wonju, Gangwon Province, together with Ahn, before the two sat down for talks.
In a joint statement issued after their talks, the two sides said they agreed to expand cooperation, including military logistics support under an Acquisition and Cross-Servicing Agreement (ACSA), maritime security coordination, and possible future cooperation involving Japan's Air Self-Defense Force and South Korea's Black Eagles aerobatic team.
"We agreed to continue exchanges and cooperation between the two countries' aerobatic teams — South Korea's Black Eagles and Japan's Blue Impulse — while also strengthening cooperation in responding to various maritime contingencies and in advanced science and technology fields, including artificial intelligence (AI)," the statement said.
Koizumi is scheduled to attend a youth forum and meet Foreign Minister Cho Hyun later in the day before wrapping up his two-day visit.
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