Several countries have military special forces operating inside Ukraine, according to one of the dozens of classified U.S. documents leaked online.

This document, dated March 23, revealed that the United Kingdom has the largest contingent of troops within Ukraine’s borders at 50, followed by Latvia, 17; France, 15; the United States, 14; and the Netherlands, one, according to the BBC.

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National Security Council coordinator John Kirby told Fox News on Wednesday that the U.S. troops in Ukraine are based in the embassy in Kyiv and are not on the front lines fighting against Russian forces.

"I won't talk to the specifics of numbers and that kind of thing. But to get to your exact question, there is a small U.S. military presence at the embassy in conjunction with the Defense Attaches Office to help us work on accountability of the materiel that is going in and out of Ukraine," Kirby said, referencing the military aid the U.S. has been sending the country. "So they're attached to that embassy and to that the defense attache."

The U.S. troops "are not fighting on the battlefield," he added. "There has been no change to the president's mandate that there will not be American troops in Ukraine fighting in this war."

Both the Pentagon and the Department of Justice have launched investigations, with the latter's being a criminal inquiry, into the trove of classified documents, now believed to be more than a hundred, that have been shared publicly on social media over the last couple of days and weeks. The Biden administration has expressed the significance of the leak but maintains there are still a lot of unknowns, including who the perpetrator is, whether he or she has more classified documents yet to be released, and whether more already-released documents have yet to be uncovered.

The administration has also acknowledged that in some cases there appears to be some manipulation of the leaked documents, though it's also unclear who has altered them and if the leaker and the manipulator are the same.

The U.K. Defense Ministry warned broadly on Tuesday that some of the classified documents contain inaccuracies.

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“The widely reported leak of alleged classified U.S. information has a serious level of inaccuracy,” a ministry spokesperson said in a statement. “Readers should be cautious about taking at face value allegations that have the potential to spread disinformation.”

South Korea and Egypt also denied the validity of claims revealed in purported classified documents that had been leaked.