Fear of poison pen?

THE safety of North Korean leader Kim Jong-un was of utmost importance during the historic summit with US President Donald Trump in Singapore on Tuesday.

Kim's security wiped down a Sharpie pen that the US provided for signing ceremony.

Then his sister, Kim Yo-jong, gave him a different one to use at the last second.

"They have a well-founded fear of somebody learning something about his health," The Daily Mail quoted John Pike of GlobalSecurity.org as saying.

"The fact that they are so insanely meticulous puts Howard Hughes to shame."

The newspaper said the North Koreans could have multiple concerns in such a situation.

One is allowing western intelligence services the chance to gain new insights about the health of the absolute ruler of North Korea, it said.