North Korea’s intention to carry on with its nuclear and missile programs cannot be tolerated, Japan’s chief envoy to stalled six-party talks for denuclearizing North Korea said on Wednesday after talks with U.S. and South Korean counterparts. reuters.com

Chinese President Xi Jinping met with high-level North Korean party officials in Beijing on Wednesday, in a sign that the two sides are trying to repair their longtime amity amid continued tensions over Pyongyang’s nuclear ambitions. wsj.com

Iran’s foreign minister says the nuclear deal reached last year with world powers can’t be renegotiated despite Republican presidential contender Donald Trump’s pledge to do so if elected. usanews.com

A new approach to nuclear structure cuts amount of computational power required. sciencedaily.com