Satellite images of a North Korean weapons factory near Pyongyang reportedly shows the expansion of one facility amid stalled nuclear talks with the U.S.

The Associated Press reported Monday that images released by the private firm Planet Labs shows what one expert at the Middlebury Institute said was potentially new construction at a long-range missile construction facility.

Jeffrey Lewis, who directs the institute's East Asia nonproliferation program, told the AP that the construction was likely tied to North Korea's desire to increase production of intercontinental ballistic missiles (ICBMs) and newer long-range missiles.

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“I would think North Korea would want 50-100 such systems. ... This would probably be some mix of ICBMs we have seen and the new system that North Korea claims is under development," he said, according to the AP.

North Korean officials have warned that a "Christmas gift" could be in store for the U.S. should negotiators fail to offer a major concession to North Korean officials before a deadline at the end of the month, following months of stalled nuclear talks that fell apart following President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE's meeting with Kim Jong Un Kim Jong UnFormer GOP lawmakers on endorsing Biden: Trump is no Republican, 'lacks basic self-control' North Korean leader Kim apologizes over killing of South Korean official Pelosi knocks Trump over refusal to commit to peaceful transfer of power MORE in February, which failed to produce a new agreement.

“The dialogue touted by the U.S. is, in essence, nothing but a foolish trick hatched to keep the DPRK bound to dialogue and use it in favor of the political situation and election in the U.S.,” a North Korean official said earlier this month. “What is left to be done now is the U.S. option and it is entirely up to the U.S. what Christmas gift it will select to get.”