North Korea’s missile launches and its U.S. counterpart, Jake Sullivan, have discussed North Korea’s missile launches, among other key security issues.

The presidential office said on Friday that the two advisers held discussions over the telephone on Thursday evening.

The top office said Kim and Sullivan expressed serious concerns about the North’s latest provocations, including launches of ballistic missiles, and agreed to further strengthen their countries’ cooperation on North Korea issues.

The two also shared the view that U.S. President Joe Biden’s upcoming visit to South Korea will provide an important opportunity for Seoul and Washington to solidify their comprehensive strategic partnership and agreed to continue coordination for Biden’s visit to be a success.