We begin in Singapore, where US Secretary of Defense James Mattis says his country still wants complete, irreversible and verifiable denuclearization of the Korean Peninsula.

Speaking at the Shangri-La Security Summit, Mattis said enforcement of UN economic sanctions against the DPRK would continue. Meanwhile, US President Donald Trump says his meeting with DPRK leader Kim Jong Un will still take place on June 12. CGTN's Jessica Stone has the details.

Trump holds talks with senior DPRK official at White House.

JESSICA STONE WASHINGTON "We are still reeling from a historic day here in Washington DC -- the first visit of a DPRK official to the White House in almost 20 years. And unlike the year 2000 when President Bill Clinton hosted Jo Myong Rok, the White House rolled out the red carpet for Vice Chair Kim Yong Chul. US President Donald Trump spent more than an hour meeting with him in the Oval Office, walked him through the rose garden and back to his motorcade, then the White House released several photos of Vice Chairman Kim and President Trump exchanging the letter from Kim Jong un as well as more inside the Oval Office.

Also, the expressions were far from somber. Trump emerged from the meeting smiling, and playful with reporters, teasing them about wanting to know the contents of the letter and telling them they'd better be ready to travel to Singapore on June 12th, also noting the historic nature of these talks moving forward. It's been nearly 70 years, he said, since the Korean war began. Remember there's still a state of war on the peninsula. And Trump not only said he's open to officially ending that war, he also said he withheld additional US sanctions from being levied against Pyongyang. But there was no clear commitment from Pyongyang to denuclearize on the timeline that Trump has demanded -- that is to say immediately.

Still, Trump is no longer looking for a final deal on the first meeting, admitting it will be a process to get an agreement that has so far eluded past leaders of both the United States and the Democratic People's Republic of Korea. Jessica Stone, CGTN, Washington."