Muted response in Seoul to Donald Trump's latest North Korea tweet

US president Donald Trump's latest tweets on North Korea have received a muted response in South Korea, where media focused more on US secretary of state Rex Tillerson's acknowledgement that the US is keeping communication channels open with the Pyongyang.

South Korea's largest daily newspaper, Chosun Ilbo, warned in an editorial that any US-North Korea talks should not recognise the North as a nuclear state, or the South would be also be forced to seek nuclear arms.