North Korea's state media has kept mum toward Kim's planned summit with Trump, and a separate meeting between Kim and South Korean President Moon Jae-in slated for late April.
Kim invited Trump to a summit after agreeing to commit to denuclearization, halt nuclear and missile tests, and expressing understanding that joint military exercises between South Korea and the us would continue.
In a Tweet, Mr Trump said: "If they drop their horrific barriers & tariffs on USA products going in, we will likewise drop ours".
He stressed that North Korea must stick to the commitments that were relayed by South Korean officials who met with Kim last week and then came to Washington and briefed Trump. A day later, White House press secretary Sarah Sanders called for "concrete actions" from the North, which led to interpretations the USA was attaching new preconditions to the summit.
On Friday, White House press secretary Sarah Huckabee Sanders said the meeting wouldn't take place "until we see concrete actions that match the words and the rhetoric of North Korea".
"The offer was made and we've accepted".
Trump said Saturday thathe believes North Korea will abide by its pledge to suspend missile tests while he prepares for the summit. Trump's announcement has raised speculation about whether the meeting will actually go ahead, what North Korea will demand from the USA and even where the two leaders might meet.
Tillerson's remarks that these things take time contrast with Trump's on-the-spot acceptance of Kim's invitation when South Korea's national security adviser informed him about it at the White House last week.
Tillerson spoke Monday at a news conference in Nigeria.
The US and the South Korea are also discussing how to conduct upcoming military drills in a way that won't provoke Kim, whose government views the exercises as a rehearsal for war.
"He's marshalled unprecedented economic and diplomatic pressure on the regime in North Korea and this breakthrough - and we hope it is a breakthrough - is a result of the strong leadership the president has provided on the world stage", Pence said.
"At the same time, all sides must exercise patience and be attentive, and show political wisdom, to appropriately face and dispel any problems and interference to resuming the talks process", state media cited Xi as saying.
President Trump has been very optimistic about the chances of these talks.
A summit between two nations that have remained in a state of war since the Korean War would be a remarkable turnabout after a year of heightened tensions.
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