The North's KCNA news agency said Sunday's launch tested its capability to carry a "large-size nuclear warhead". After Sunday's launch, Pyongyang gleefully hailed significant advances in developing a nuclear missile capable of reaching the USA mainland.
The comments came hours after the South, which hosts 28,500 United States troops, said it wanted to reopen a channel of dialogue with North Korea as Mr Moon seeks a two-track policy, involving sanctions and dialogue, to try to rein in its neighbour.
"Combining nuclear warheads with ballistic missile technology in the hands of a volatile leader like Kim Jong Un is a recipe for disaster", Harris told the Sasakawa Peace Foundation, referring to North Korea's leader. "Instead of insisting on the withdrawal of this system, China can accept some technical modifications to the system and make it less threatening to the country's nuclear deterrent".
South Korea and the U.S. say it is necessary to guard against North Korea's missile and nuclear weapons activities that threaten South Korea, Japan, U.S. territories and possibly even the continental United States.
The US said on Tuesday it believed it could persuade China to impose new United Nations sanctions on North Korea and warned that Washington would also target and "call out" countries supporting Pyongyang.
North Korea has carried out two atomic tests and dozens of missile launches since the beginning of past year, in its quest to develop a missile capable of delivering a nuclear warhead to the continental US.
Kim witnessed the test and "hugged officials in the field of rocket research, saying that they worked hard to achieve a great thing", according to KCNA. It flew to an altitude of 2,111.5 kilometers, and traveled 787 kilometers before landing in the Sea of Japan.More news: Trump denies ever urging Comey to back off Flynn investigation
Moon supports resuming talks between South and North Korea, and after his election victory, Chinese President Xi Jinping called him and vowed to work together for the "common goal" of a denuclearized Korean peninsula.
There seems to be a convergence of opinion between the Moon administration and the United States since Moon has qualified his call for moderation toward North Korea by asking for some concessions from Pyongyang to get talks restarted.
State Councilor Yang Jiechi made the remarks at the opening of a second day of meetings between Chinese officials and special envoy Lee Hae-chan, a former South Korean prime minister.
But Kim Dong-yub, professor at South Korea's Kyungnam University, told local media that they'd be lucky to reach Alaska or Hawaii, at best.
The intermediate-range ballistic missile launched from the city of Kusong.
Moon's hopes for a softer approach have been complicated by North Korea's rapid progress toward its stated goal of developing a nuclear-tipped missile that could reach the USA mainland.
U.S. Ambassador to the United Nations Nikki Haley put the American position in forceful terms on Tuesday: "We have to turn around and tell the entire worldwide community: You either support North Korea or you support us". The US has taken an aggressive approach to North Korea having claimed that a policy of strategic patience had obviously failed. "The president said we are leaving open the possibility of dialogue with North Korea, but we should sternly deal with a provocation to prevent North Korea from miscalculating".