In this December 23, 2017, photo distributed on December 24, 2017, by the North Korean government, North Korean leader Kim Jong Un addresses a ruling party conference in Pyongyang.
North Korea has come under heavy sanctions imposed by the UN Security Council as it has accelerated efforts to expand its nuclear weapons and ballistic missile program. Relations between the Koreas have plunged as North Korea has expanded its weapons programs amid a hard-line stance by Moon's conservative predecessors.
He used the message to warn the U.S. that the country is now in range of his nuclear warheads.
Kim said that rather than encouraging USA measures that "threaten the security and peace of the Korean peninsula", Seoul should instead respond to overtures from the North, and "stop nuclear war exercises with foreign forces".
North Korea has rattled the worldwide community in recent months with multiple missile launches and its sixth and most powerful nuclear test - purportedly of a hydrogen bomb.
"No matter how much America wants to attack us with their military might and nuclear power, they know that now we possess such great nuclear power", he said.
Brutal cold continues… Wind Chill WARNING through Tuesday
If you have any plans for New Year's Eve or you're out and about, be sure to bundle up if tackling the cold. A cold wind from the northwest at 10-15 miles per hour will keep the wind chill in the single digits again.
"Kim Jong Un's strategy remains the same". (This may not be the case in a crisis, where Kim Jong-un may be forced to tolerate some level of predelegation to retain credible retaliatory capability.) Kim, nevertheless, appeared pleased with his arrangement: "The U.S. could never launch a military attack on me", he said.
Lee Hee-beom, president of the Pyeongchang Organizing Committee, said it welcomed North Korean participation and would "discuss relevant matters with the South Korean government as well as the International Olympic Committee".
The South Korean president requested the ministries of unification and sports to swiftly create measures to help North Korea participate in the upcoming Pyeongchang Winter Olympics.
Kim said: "The Winter Olympic games that will be held soon in the South will be a good opportunity to display the status of the Korean nation, and we sincerely wish that the event will be held with good results".
"This is reality not a threat".
Choi met North Korea's sports official Mun Woong in China on December 18 on the sidelines of a worldwide youth football tournament where North and South Korea soccer teams competed, the Dong-A Ilbo newspaper reported.
If Kim can make it through 2018 without being annihilated in a war with the USA or somehow forced to relinquish his WMDs, North Korea will likely become a full-fledged nuclear weapons state sometime this year, with all the deterrent capability and geopolitical clout that entails.