North Korea's proclaimed shift in national focus to economic development from nuclear arms is prompting cautious optimism across the Chinese border in Dandong, a trading hub hit hard by United Nations sanctions against Pyongyang.

Travel agents in the Chinese city say they have seen a surge of interest from across the country in recent weeks, boosting an already strong peak tourism season.

North Korean leader Kim Jong Un's economic reform plans and warming ties between Pyongyang and its main backers in Beijing were behind the jump in activity, agents said.