They confirm what has become increasingly obvious in the past few months - that Mr Trump's summit with Mr Kim last June has done little to stop the North from consolidating its long-range nuclear capability.
The images appear to show that Yeongjeo-dong missile base and another, previously undiscovered, nearby site remain active.
"Moreover, in the past year North Korea has significantly expanded a nearby facility that appears to be another missile base", said researchers at the Middlebury Institute of International Studies at Monterey.
Trump has often touted North Korea's lack of ballistic missile tests in recent months as a sign of diplomatic progress and said Kim's offer to dismantle some testing facilities signals the North Korean leader is serious about denuclearizing.
"We watch North Korea very closely", Pentagon spokesperson Lt. Col. Chris Logan told CNN.
But the North has rejected demands for what it calls "unilateral" disarmament, and has instead sought unspecified reciprocal USA measures in a gradual process.
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However, Ri's visit follows hard on the heels of last week's US-China summit in Argentina, which included discussion of North Korea.
"Meeting Kim again only validates Kim's strategy of using Trump to play for time and sanctions relief, and keep North Korea on the pathway to becoming a de facto nuclear weapon state", Medeiros told The New York Times.
The top diplomats were expected to exchange views on an apparent stalemate in the dialogue with Pyongyang, the possibility of North Korean leader Kim Jong-un's Seoul visit and his second summit with US President Donald Trump. On Saturday, he told reporters that his next meeting with Kim was likely to happen in January or February.
The North officially suspended its nuclear and missile tests ahead of the June summit, and missile production and deployment does not technically violate any agreement between Pyongyang and the US and South Korea.
At the time, some experts said the United States could soon accept a North Korean request for jointly declaring the end of the 1950-53 Korean War as part of security assurances to the North.
In his meeting with Trump, Kim made a vague pledge to "work toward the complete denuclearization of the Korean Peninsula" in return for "new" relations and security guarantees from Washington.
The bases are believed to serve as shelters for mobile missile launchers, and would be able to store the country's newest long-range missiles, including those capable of carrying nuclear warheads.