Ri told the United Nations General Assembly earlier on Saturday that targeting the US mainland with its rockets was inevitable after "Mr. Evil President" Donald Trump called Pyongyang's leader "rocket man".
"Just heard Foreign Minister of North Korea speak at U.N. If he echoes thoughts of Little Rocket Man, they won't be around much longer!" Trump tweeted.
(Reporting by Lincoln Feast in Sydney; Editing by Paul Tait)
© Thomson Reuters 2017
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)