South Korea said Tuesday it's seeking closer ties with Indonesia on defense goods as part of efforts to expand its overall arms trade.

Defense Minister Song Young-moo plans to discuss the issue when he meets his Indonesian counterpart Ryamizard Ryacudu in Seoul later in the day, according to his office.

He's on a trip to South Korea to attend a delivery ceremony for a submarine built by the local defense contractor Daewoo Shipbuilding & Marine Engineering Co.

Indonesia has ordered three diesel-electric attack submarines from South Korea.

It has signed a separate deal to buy South Korea's T-50 supersonic trainer jets in addition to a bilateral partnership on Seoul's KF-X program to develop its own advanced fighters.

The ministers will have discussions on "ways for expanding South Korea's superb weapons system, including the additional export of three submarines Indonesia needs," said Song's ministry.

Also on agenda is North Korea, it added.

"The ministers will express deep concerns about North Korea's nuclear and missile threats that are increasing recently and discuss ways for close coordination," it said.

Meanwhile, the ministry stated that it will step up efforts to develop the defense industry as one of the nation's next growth engines in tandem with the fourth industrial revolution.

The reform-minded Song, a former naval chief, believes the local defense industry is too dependent on domestic demand.

It has called for an export-oriented strategy. (Yonhap)