Despite North Korea's strong denial, it now seems almost certain that North Korea was indeed behind the killing. VX is very difficult to obtain -- but North Korea is known to manufacture it , according to organization Nuclear Threat Initiative. Because the UN Security Council has banned North Korea from possessing -- let alone using -- chemical weapons, we can expect a flurry of activity in New York, and probably new, tougher sanctions on North Korea. JUST WATCHED North Korea denies involvement in assassination Replay More Videos ... MUST WATCH North Korea denies involvement in assassination 02:54The discovery that the North Koreans may have released a lethal toxin in its main international airport would test even the most solid international relationships. But perhaps worst of all for North Korea, the events will have infuriated China -- North Korea's only true ally and principal supporter.

Source: CNN February 24, 2017 22:18 UTC