The United Nations political affairs chief expressed willingness to ease tension on the Korean peninsula during a visit to North Korea this week, state media said on Saturday, amid a rising war of words over the North’s missile and nuclear programs. Two minor tremors detected on Saturday from North Korea were probably aftershocks from the country’s massive nuclear test in early September, a US Geological Survey official said. Mankind’s destruction caused by a nuclear war is just one “impulsive tantrum away”, the winners of the Nobel peace prize, the International Campaign to Abolish Nuclear Weapons (ICAN), warned on Sunday as the United States and North Korea exchange threats over the nation’s nuclear tests.