Leaked Pentagon documents paint grim picture of Ukrainian air defense supplies, may only last a month

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US searches for source of highly-classified intel leak

Rep. Cory Mills, R-Fla., discusses the 100+ classified documents leaked online.

The leaked U.S. Pentagon documents paint a grim picture of Ukraine's air defense outlook, predicting that the country could run out of key assets before the end of May.

Ukraine's S-300 air defense systems could run out of ammunition by as early as May 2, while the country's other air defenses could be depleted by May 23, the documents warn. The documents, dated to late February, state that systems like the S-300 make up some 89% of Ukraine's air defense capability.

Should Ukraine lose its ability to threaten Russian aircraft encroaching on its territory, the conflict could quickly turn.

Currently, Russia maintains a fleet of some 485 fighter jets, compared to Ukraine's 85. Should air defense systems go offline, Ukraine's lopsided numbers game in the air would be its only means of securing the sky over Ukrainian troops.

UKRAINE WAR PLANNING DOCUMENTS LEAKED ONLINE, PENTAGON INVESTIGATING

Ukraine is quickly running out of key air defense systems, leaked documents show, and its supply could run dry completely by mid-May, granting Russia a huge opportunity to advance. (AP Photo/LIBKOS, File)

The Pentagon suffered a major leak of classified documents last week, some of which detailed the dwindling supply of anti-air defense munitions for Ukraine. (Staff/AFP via Getty Images)

The Pentagon said on Sunday that an interagency task force is assessing the validity and impacts of the "sensitive and highly classified material" that has leaked online.

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The leaked documents pertain to a wide range of issues and countries, detailing one instance in which a British spy plane was nearly shot down by a Russian jet off the coast of Crimea last year. U.K. Defense Minister Ben Wallace previously told the British Parliament that the Russian jets flew "recklessly," but chalked the missile launch up to a "technical malfunction."

The leaks also suggested that Israel's intelligence agency, the Mossad, had secretly encouraged the mass protests against Israeli Prime Minister Benjamin Netanyahu last month.

It alleged that Mossad "advocated for Mossad officials and Israeli citizens to protest the new Israeli Government’s proposed judicial reforms, including several explicit calls to action that decried the Israeli government, according to signals intelligence."

The U.S. has opened a criminal investigation into the severe leak of classified documents relating to U.S. allies across the globe. (Joe Raedle/Getty Images)

Netanyahu's office, which is in charge of Mossad, dismissed the claims in a statement to Fox News Digital.

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"The report that was published overnight in the American press is mendacious and without any foundation whatsoever. The Mossad and its senior officials did not – and do not – encourage agency personnel to join the demonstrations against the government, political demonstrations or any political activity," the prime minister's office wrote on behalf of the Mossad.

Fox News' Jennifer Griffin contributed to this report.