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North Korean leader Kim Jong Un, left, on May 10, 2016, in Pyongyang, North Korea, and Kim Jong Nam, right, exiled half brother of Kim Jong Un, in Narita, Japan, on May 4, 2001. Image Credit: AP

Washington: The United States formally concluded Tuesday that North Korea ordered the murder of a half-brother and potential rival to ruler Kim Jong-Un, Kim Jong-Nam, with the VX nerve agent.

“This public display of contempt for universal norms against chemical weapons use further demonstrates the reckless nature of North Korea and underscores that we cannot afford to tolerate a North Korean WMD program of any kind,” State Department spokeswoman Heather Nauert said.

The finding triggered another layer of US economic sanctions against Pyongyang, just as South Korea reported that the regime is ready for talks to end a nuclear standoff.