The talks, on Panetta’s first trip to Asia as Pentagon chief, are part of a broader Obama administration effort to shore up South Korean confidence in a military alliance that has endured for six decades.

Panetta has called the North “reckless” and a “serious threat” to peace on the Korean peninsula, which exploded in war in 1950 and drew the US and other nations into a bloody three-year conflict against the North and China.

Separately, the State Department’s top Asia policy official, Kurt Campbell, was in Seoul to brief officials on this week’s US-North Korea talks in Geneva.