UPDATE 1-North Korea says linking cyber attack to Pyongyang is 'ridiculous'

UNITED NATIONS, May 19 (Reuters) - North Korea's deputy U.N. envoy said on Friday "it is ridiculous" to link Pyongyang with the WannaCry "ransomware" cyber attack that started to sweep around the globe a week ago and has infected more than 300,000 computers in 150 nations