The Sohae station is North Korea's main satellite launch facility.
"The US just came out with such unilateral, robber-like denuclearisation demands as CVID (complete, verifiable and irreversible dismantlement), declaration and verification that go against the spirit of the North Korean-US summit meeting", the spokesperson said.
North Korea has begun dismantling what are believed to be key facilities in its intercontinental ballistic missile program, according to monitoring group 38 North. "But the relationships are very good", Trump said last week.
Speaking at a news conference after his June 12 meeting with Kim in Singapore, Trump said Kim promised that Pyongyang would destroy a major missile engine testing site soon, in an apparent reference to Sohae.
King's assessment comes as skepticism grows over Trump's North Korea strategy.
North Korean media have urged South Korea to make active efforts to declare an end to the Korean War in line with the Panmunjeon Declaration.
In the lead up to Trump's face-to-face meeting with Kim, the USA president showed his masterful deal making skills in action.
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But the deal was criticised for a lack of details on when or how Pyongyang would renounce its nuclear weapons.
On Twitter, 38 North's founder, Joel Wit, said the images suggested that North Korea may be willing to "give up its space launch programme".
"Since that time, we've seen indeed, a change of at least the approach", Brooks said.
If the United States is unwilling to replace the armistice agreement that ended the Korean War with a permanent peace that would ensure the survival of North Korean leader Kim Jong Un's regime, Pyongyang will likely not proceed further with denuclearization talks, the source said.
In a typical commentary late last week, the North Korean ruling party's daily newspaper, Rodong Sinmun, called Japan "impotent" in the political and diplomatic arena and said Kono was a "political charlatan".
In the meantime, the North Korean economy is suffering badly. "Our forces in South Korea are stabilizing for Asia", he said.
At the UN meeting last Friday, U.S. Ambassador to the UN Nikki Haley slammed "some friends who want to go around the rules", especially Russian Federation and China for blocking the sanctions committee from demanding a halt to shipment of petroleum products to North Korea. "The process is moving along", he tweeted.
Chosun Ilbo also reported that the South Korean Foreign Ministry learned about two cargo vessels suspected of carrying North Korea coal shortly after the ships entered South Korean ports in October past year, citing lawmaker Chung Byoung-guk of Bareun Future Party.