Since coming to power in 2011, Kim has not met another head of state in North Korea.
After Trump received the letter, he announced that the June 12 summit with North Korea was on again in Singapore.
Washington wants North Korea to quickly give up all its nuclear weapons in a verifiable way in return for sanctions and economic relief. "Kim Jong Un", Assad said, the North's state-run KCNA news agency reported, using the abbreviated version of the country's official name.
Over the past week, Washington and Pyongyang have held a series of talks to prepare for the summit, including in Singapore and NY. It was expected that General Kim Yong-Chol would have dinner with the US Secretary of State, Mike Pompeo.
The White House has said preparations for a meeting were going ahead.
The US is reportedly looking for ways to facilitate travel accommodations for North Korean officials set to meet President Donald Trump on June 12.
More Africans smoke, die of tobacco-induced sicknesses, says WHO
According to him, there is low level of awareness on the risks that tobacco smoking constitute to the human heart. An average of 27 people die every week in the UAE due to tobacco related diseases.
China slams 'irresponsible' US comments on South China Sea
The South China Sea is one of the busiest shipping lanes in the world, and rich in fish and potential oil and gas reserves. China had participated in these exercises in 2014 and 2016. "It calls into question China's broader goals", Mattis said.
North Korean official Kim Yong Chol arrives at White House
Donald Trump's summit with Kim Jong-un in Singapore on 12 June is back on, the USA president says, a week after it was scrapped. The State Department official said they were seeking a corresponding commitment and "action" from the North Koreans.
"We will excitedly but calmly look forward to the historic meeting to be held in Singapore", he added.
"I'm still convinced that if he's in this process, even if the summit is ongoing and we're moving out, if this thing isn't heading towards the obvious objective he'll pull out".
"It seems as if the road to a North Korea-U.S. summit has become enhanced and expanded", Kim Eui-kyeom, a Seoul government spokesperson, said in a statement hours after Trump had made his announcement.
Others wondered, will Trump reciprocate with an equally large letter? -North Korea summit, which President Donald Trump reinstated the previous day. Pompeo and Chief of Staff John Kelly were also spotted inside the Oval Office for the meeting with President Trump.
"Between now and if we're going to have a summit, they're going to have to make clear what they're willing to do".
Meanwhile, North and South Korea say they've agreed to more talks to promote peace.