"We are trying to review this phase, to make sure that everything is done by year-end as planned, and then we want to have some discussions about what the next phase might look like," said Hill, who last visited Pyongyang in June.
Exchanges between the US and North Korea have increased since North Korea agreed in February to a multinational deal to freeze and then roll back its nuclear arms programme in return for massive aid and better international standing.
Meanwhile, North Korea's spy chief will make a rare trip to South Korea this week to discuss agreements struck during a summit between the countries last month, the South's unification minister said yesterday.
Kim Yang-gon is to travel by land across the heavily fortified border today for a three-day trip, Unification Minister Lee Jae-joung told reporters.
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