President Trump has twice met with Kim Jong-un, but neither neutral-site summit resulted in an agreement on denuclearizing North Korea, the more recent gathering in Vietnam last month breaking up over sanctions relief for Pyongyang.
The release of the images arrives in the wake of stalled talks between the US and North Korea regarding the state's nuclear programme and just days after reports said that North Korea had begun to reassemble its Sohae satellite launch facility, which has been used for several attempted space launches over the years.
"The public at home and overseas... are feeling regretful, blaming the USA for the summit that ended without an agreement", an editorial published by Pyongyang's official news agency KCNA said.
On Friday US President Donald Trump said he would be disappointed if North Korea was to resume weapons testing.
The latest summit clearly showed that Kim's denuclearization pledge was a lie.
In Hanoi, Donald Trump overturned the widely held assumption he would be willing to settle for an interim agreement on North Korea's denuclearization.
The specialised website 38 North and the Centre for Strategic and International Studies used commercial satellite imagery to track construction at the site - which they said began before last week's aborted summit in Hanoi between Mr Trump and North Korea's Kim Jong Un.
"The intent of the North Koreans in this matter is known only to them".
The Ministry of Unification handles relations with North Korea.
In other words, Washington wants what administration officials have called a "big deal" - "the complete elimination of their weapons of mass destruction programme", the State Department official said. While the USA and South Korea have canceled their annual large-scale war games, Washington is poised to consider strengthening its sanctions on Pyongyang unless progress is made on denuclearization. Biegun, the USA envoy to North Korea, gave members of the Senate Foreign Relations Committee a classified update Tuesday afternoon on Capitol Hill.
Satellite images of a North Korean rocket assembly facility suggest possible launch preparations, an expert told CNN.
North Korea has frozen nuclear and missile testing since 2017, and Trump has pointed to this as a positive outcome from almost a year of high-level engagement with North Korea.
In a new breach, three South Korean companies were found to have brought in more than 13,000 tons of North Korean coal, worth 2.1 billion won ($2 million) since 2017, South Korea said. The paper is saying that both within North Korea and outside the country, people are generally believing that the USA was to blame. "We also don't know how far the train has gotten".
There are close to 30,000 USA troops stationed in South Korea, and their annual drills with tens of thousands of South Korean soldiers have always infuriated the North - with Pyongyang condemning the maneuvers as provocative rehearsals for invasion.