The US Forces Korea had previously stationed tactical nuclear weapons in South Korea as a deterrent against North Korea's potential attacks, but they were sent home in 1991 after the two Koreas agreed to make the peninsula free of any nuclear bombs. 

But the North's advancement of its nuclear weapons program through five nuclear tests have given rise to a call to bring back the US tactical weapons in South Korea.

"Our government has been maintaining the policy line of denuclearization," the spokesman said.

Still, the issue is not something that the South Korean government needs to comment on publicly since the US is currently reviewing its policy toward North Korea, he noted. (Yonhap)