WASHINGTON—North Korea attempted to sell a form of lithium metal, a key material for developing miniaturized nuclear weapons, to unidentified international buyers last year, according to United Nations investigators tracking dictator Kim Jong Un’s weapons-of-mass-destruction programs. The attempted sale, documented in a U.N. report this month, has sparked new concern in the Trump administration, Congress and the U.N. about the...

Source: Wall Street Journal March 09, 2017 00:22 UTC