South Korea is to purchase an additional 90 Taurus cruise missiles from Germany, state news agency Yonhap reported Tuesday.
The 1.4-ton, 5.1-metre guided missiles can be dropped by fighter jets and would be used in an emergency scenario against nuclear and rocket facilities in North Korea, according to media reports.
The additional missiles would boost the arsenal of 170 Taurus missiles South Korea has already ordered, according to Yonhap.
A Defence Ministry spokesman in Seoul said he could not confirm the report, which added that South Korea would be the first Asian country with fighter jets to be armed with the cruise missiles.
The missiles have a range of 500 kilometers and can lock onto and destroy targets behind six-foot thick walls.
North Korea carried out two nuclear tests this year, the latest on September 9, despite international warnings and sanctions.