Argument: Korea is the sole exception requested by US to mine ban
"The Mine Ban Treaty and the US Government: 10 Years and Waiting". US Campaign to Ban Landmines. 3 Dec. 2007: "There is no evidence that the U.S. has used antipersonnel landmines, with the exception of the North/South Korean border area, since 1991." And, it seems to be the sole exception requested by the US as a condition of it agreeing to joining the Land Mine Ban Treaty.