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Da Wei, director of the International Strategy and Security Research Center, University of International Relations:

Days before their meeting, Chung visited Washington. Kim is forecast to meet with Trump in May or early June, but the location and the exact date for the first-ever DPRKUS summit has yet to be determined.

Daniel Turner, senior lecturer in marketing, events and tourism at the University of West Scotland, said there is a natural synergy between traditional Scottish tourism offerings and the Chinese market.

Daniel Di Martino, a Venezuelan economic analyst, said Panama under Laurentino Cortizo, who was sworn in as the country's president on July 1, is not likely to stop any ships from making their way through the canal. The Panamanian authorities know the US needs the canal, but they were willing to go ahead despite US threats of sanctions, Di Martino said.

Dalia Dassa Kaye, a researcher at the Rand Corporation, said it was not surprising that many European nations are taking a defiant tone.