Stimson

"Trump's America-first policy will bring challenges and threats to almost all countries in the world," says Yun Sun, director of the China programme at the Stimson Centre.

"It's definitely a possibility," says Jenny Town, a senior fellow at the Stimson Center and the director of Stimson's Korea Program.

It also could be an attempt by Trump to show the world "he has the ability to influence Xi's decision-making and they have a special relationship", says Yun Sun, the director of the China program at the Stimson Center in Washington.

These soldiers are “trained to withstand a high degree of physical pain and psychological torture”, says Michael Madden, a North Korea expert from the Stimson Center in Washington.

“Building the infrastructure and capacity to produce its own fissile material will take several years at best, as well as the time it will take to design, test and manufacture the weapons and compatible delivery systems,” said Jenny Town, a senior fellow at the Stimson Center, a think tank in Washington.