Efforts to denuclearize North Korea will continue despite a new foreign minister in Pyongyang who is seen as a hard-liner and could take a tougher stance in stalled negotiations, a senior State Department official said Wednesday.

The official would not forecast how the new foreign minister, Ri Son-gwon, who succeeds Ri Yong-ho, might approach negotiations with the United States over removing nuclear weapons from the Korean Peninsula…

Privately, though, some officials acknowledge that the administration has gotten nowhere, and that there is no sign the North will give up its nuclear weapons.