The obvious option would to be for them to force Iran and North Korea to abandon their nuclear programs and for the USA and Russia/China to return to the M.A.D.
The increasing pressure on North Korea also comes amid speculations that the Trump administration is seriously considering a limited military strike on North Korea.
US Ambassador Robert Wood, also at that conference, insisted everything was North Korea's fault, but did not appear to contest the idea that the US was gearing up for such a sneak attack.
North Korea may be just months away from being able to hit the USA mainland with a nuclear-tipped ballistic missile, a senior American disarmament official said Tuesday - as Pyongyang said Washington was considering a pre-emptive strike against it.
It took aim at the Pentagon's proposal to develop a nuclear cruise missile that could be launched from a ship or submarine. It has toned down its threats lately, with its preparations for its participation in the Winter Olympics this month in South Korea. Both the United States and the Un General Assembly have imposed tight economic sanctions on North Korea in a bid to starve them of the resources and manpower that is behind the weapons program.
Although the new NPR says the US will only consider the use of nuclear weapons "only in the most extreme circumstances", it explicitly indicates the possibility of a nuclear response to counter even non-nuclear attacks.
United States and South Korean troops utilizing the Army Tactical Missile System (ATACMS) and South Korea's Hyunmoo Missile II, fire missiles into the waters of the East Sea, off South Korea, on July 5, 2017.
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"(Kim's visit) shows North Korea's resolve for improved inter-Korean relations and the success of the Olympics, as well as its honest, earnest attitude", Blue House spokesman Kim Eui-kyeom told a news briefing on Monday.
When the United States goes to war, it tends to go full throttle - in recent times, this has translated into regime change (think of Afghanistan, Iraq, and Libya).
"This time, if he gets to meet Moon, he could convey Kim Jong Un's message or invitation to Pyongyang", Cheong said. US ally South Korea would not want to be the only Korea left without a nuclear device.
The letter was sent after President Trump suggested that his administration could use a "bloody nose" strategy to show Pyongyang what it would face in an all-out war scenario.
Pugwash's mission is to bring scientific insight and reason to bear on namely, the catastrophic threat posed to humanity by nuclear and other weapons of mass destruction.
North Korea has since hit back and accused the USA of preparing for a "pre-emptive strike against the Democratic People's Republic of Korea". While the appalling humanitarian consequences of this don't need to be spelt out, the strategic illogic of the arguments advocating a first strike must be continually reinforced.