His single-minded pursuit of a nuclear arsenal to counter what he sees as the threat of invasion by the US has ratcheted up tensions not only with his rivals but also with primary trading partner China and with Russia, once a key benefactor.
Kim Yo Jong, 28, is the first member of the ruling Kim family bearing the bloodline of the sacred Mount Paektu, a centerpiece of the North's idolization and propaganda campaign, to cross the border into the South since the 1950-53 Korean War.
With plenty of time left on the clock, Korea were at risk of total humiliation as Lara Stadler bagged a double to extend their lead to eight.
Ms Kim, who arrived in Seoul last Friday to attend the opening of the Pyeongchang Winter Olympics, presented Mr Moon with a letter from her brother which stated his willingness to improve inter-Korean ties.
The 17-year-old American would have qualified for the Sochi Olympics, but she was too young. "We apologize for the inconvenience caused to all those affected".
"Obviously this game had more meaning than just a game", said Danelle Im, a Canadian who plays for the Korean team, "so it was great to be a part of it.". "It's got a lot of money - that draws hackers like flies to a candle", said cybersecurity expert Jim Lewis.
There was a carnival atmosphere as the near-capacity crowd cheered hard for their home team from the moment the puck dropped and roared each time a Korean player held possession. She earlier declined to speculate on the cause and said she did not want to call it a cyberattack.
Switzerland's Alina Muller scored first-period hat-trick and added a fourth in the second period as the hosts where shut out at a packed Kwandong Hockey Center, bolstered by a contingent of North Korean cheerleaders. It led to the revival of a communication hotline that had gone unused for two years as officials negotiated the North's participation.
"Present there were members of a high-level delegation of the DPRK and its National Olympic Committee delegation, art troupe and cheering group", it went on.