"As we hear reports that North Korea might be preparing for another missile test, I hope that does not happen, but if it does we must bring even more measures to bear on the North Korean regime", Haley said. In the days ahead, we will be calling for an emergency session both here in NY, and at the Human Rights Council in Geneva.
Kim also said he was open to the possibility of North Korean athletes taking part in Winter Olympics South Korea hosts next month.
At the same time, he said North Korea would focus in 2018 on "mass-producing nuclear warheads and ballistic missiles for operational deployment".
"The civilized world must remain united and vigilant against the rogue state's development of a nuclear arsenal".
Haley gave no details of the missile test preparations.
The year ended without any further clarity on the path to such dialogue - whether a simple pause in missile and nuclear testing would be sufficient, or whether the United States would require additional preconditions.
"We consider this to be a very reckless regime".
Choi met North Korean 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. "They wanted to see the embassy moved to Jerusalem, and we followed through with that".
Trump has frequently derided Kim as "rocket man".
"Sanctions and "other" pressures are beginning to have a big impact on North Korea".
Washington has spearheaded the global push to sanction North Korea at the United Nations, which past year slapped three rafts of economic sanctions on the regime, targeting its oil, coal, iron, fisheries and textile sectors. "It is entirely connected to Pakistan's harboring of terrorists", she said.
The South Korea's unification minister, Cho Myoung-gyon, proposed holding high-level talks with North Korea next week in the border village of Panmunjom, where they last held contacts two years ago.
Watch Haley make those remarks below, via Fox News.
Should the talks be held on January 9, it would be the first such dialogue since a vice-ministerial meeting in December 2015.
Amid the heated rhetoric, South Korean President Moon Jae-in called for his government to "quickly" act on his North Korean counterpart's offer of dialogue a day earlier.