In a potential sign that the U.S. is preparing to reach a deal in Hanoi with North Korea that could include a so-called end-of-war declaration and the opening of liaison offices in both countries, a top State Department lawyer who has handled key issues in East Asia is taking part in negotiations, sources confirmed to The Japan Times on Wednesday.

Robert Harris, an assistant legal adviser for East Asia and Pacific Affairs with the State Department, is involved in the nuclear talks with top North Korean officials, two informed sources said on condition of anonymity.

Harris did not immediately respond to an email for comment.