North and South Korea yesterday reopened a cross-border hotline which had been shut down since 2016, forging ahead with peace overtures despite taunts from US President Donald Trump who said he has a "much bigger" nuclear button than Kim Jong-Un.
The hotline was restored at 0630 GMT after Seoul proposed high-level talks in response to an olive branch from the North's leader, who has offered to send a team to next month's Winter Olympics in the South.
"The phone conversation lasted 20 minutes," a South Korean Unification Ministry official told AFP, adding details were not known immediately.
Kim's overtures to the South marked a rare softening in tone. Tensions have surged in recent months following a flurry of North Korean missile launches and its most powerful nuclear test yet.
Seoul responded with an offer to hold talks on January 9 -- the first since 2015 -- to discuss "matters of mutual interest" including the North's Olympic participation.
But Kim's New Year address also included a warning to the US that he has a "nuclear button" on his table, prompting a furious response from Trump via Twitter.
"North Korean Leader Kim Jong Un just stated that the 'Nuclear Button is on his desk at all times.'
"Will someone from his depleted and food starved regime please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!" he said.
The tweet generated Twitter responses largely of scorn and alarm.
"This borders on presidential malpractice," said Democratic Senator Ed Markey.
"Our President is a child. 'Mine is bigger than yours' may sound tough on the playground, but this is no juvenile affair. Literally millions of lives are at stake," tweeted Colin Kahl, a former national security adviser to then Vice-President Joe Biden.
But Trump's ambassador to the UN Nikki Haley maintained the tough line, playing down Seoul's offer to hold talks. These would be a "band-aid" unless denuclearisation was also up for discussion, she said.
US State Department spokesman Heather Nauert also warned Kim "may be trying to drive a wedge of some sort between the two nations.