"If North Korea does not have UDMH, it can not threaten the United States, it's as simple as that", Democratic senator Edward Markey said.
China and Russian Federation agreed that tensions on the Korean Peninsula must be solved peacefully and the "vicious cycle" must end, when their foreign ministers met on Monday in NY on the sidelines of the United Nations General Assembly.
North Korea's nuclear weapons and missiles have become rocks of various sizes after rolling for over 20 years.
German Foreign Minister Sigmar Gabriel on Sunday urged worldwide powers to diplomatically engage with North Korea to end its nuclear and ballistic missile programs.
Prior to that, one was intermediate-range, two were medium-range, eight were either short-range or medium-range and the range of one is unknown, reports suggest.
For example, U.N. Security Council Resolution 1874, passed unanimously in 2009, authorized member states to inspect ships carrying suspicious North Korean cargo.
"The New York Times: "North Korea's Threat Pushes Japan to Reassess Its Might and Rights - "... officials in Japan who may have considered intercepting the missile faced two immediate constraints: "The country's missile defenses are limited, and the Constitution limits military action only to instances of self-defense".
In the meantime, UNICEF's regional director for East Asia and the Pacific, Karin Hulshof, said North Korean children faced problems that were "all too real".
The North Korean nuclear threat is among the hot-button issues world leaders are grappling with in NY for a United Nations global summit this week.
The Japanese prime minister, Shinzo Abe, reportedly asked the South Korean president, Moon Jae-in, to reconsider the timing of the aid package in a recent telephone call.
The diplomats also said the two governments are not communicating the same message, with South Korea saying it can not afford another war on the Korean peninsula.
He was asked why the USA, which has spent tens of billions of dollars on missile defense programs in recent decades, has not tried to intercept North Korea's rockets as they demonstrate an increasingly sophisticated missile capability.
The foreign ministry statement said that the increased moves of the USA and its allied forces to impose sanctions and pressure on the Democratic People's Republic of Korea (country's official name) will only "increase our pace towards the ultimate completion of the state nuclear force".
The diplomatic exchanges at the United Nations come as the USA president has not ruled out a military option against Pyongyang. Later in September, North Korea fired a ballistic missile which passed through Japan's airspace near Hokkaido.
Andrei Lankov, a North Korea expert at Kookmin University in South Korea, described Trump's threats as similar to the type of bluffing that North Korea has used for decades.