South Korean President Moon Jae-in said today North Korean and U.S. officials are holding “behind-the-scenes talks” in preparation for a third summit between President Trump and Kim Jong-un. The two heads of state last met in Hanoi, Vietnam, in February, but those talks fell apart after Trump walked away without making a deal. Although U.S. and North Korean leadership have hit a wall over the issue of sanctions relief—which North Korea says is a necessary condition for any denuclearization deal—Trump and Kim recently exchanged personal letters, which appeared to indicate a commitment to renewing talks.