The Biden administration has reportedly readied another $800 million to send to Ukraine as part of a security and military aid package that could be announced as early as Friday amid concern of a possible attack on a nuclear facility in the country.

President Joe Biden could authorize the funds through the Presidential Drawdown Authority, an ability of the president to reallocate defense articles from the Department of Defense to foreign countries in times of crisis, which Biden has previously used to assist Ukraine, Reuters reported.

The total for the aid package could change before it is finalized, according to Reuters, citing "three sources familiar with the matter."

The funds come as Ukrainian President Volodymyr Zelenskyy warned in a tweet on Thursday that "the world is on a verge of nuclear disaster."

U.S. President Joe Biden in the State Dining Room of the White House August 16, 2022 in Washington, DC. (Drew Angerer/Getty Images)

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"How long will it take the global community to respond to Russia's irresponsible actions and nuclear blackmailing?" Zelenskyy asked, referencing a possible attack on the Zaporizhzhia nuclear plant, Europe's largest nuclear plant.

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Rebekah Koffler, a freelance consultant and intelligence expert on Russian affairs, told Fox News Digital that Russia "is likely" planning an attack or is using the threat of an attack as a distraction.

"It is likely that Russia is the one that is either preparing to stage a provocation to cause a nuclear incident, attempting to cover up something that has already taken place, or is simply agitating to cause confusion and distraction ahead of the UN Secretary-General visit," said Koffler.

Agence France-Presse (AFP), a French news outlet, reported Ukraine is conducting nuclear defense drills "to prepare for all scenarios" regarding the nuclear plant.

Russian news outlet RT has reported Russia is also preparing for an attack, claiming Ukrainian forces could fire upon the nuclear plant and blame them for the destruction.

A general view shows the Zaporizhzhia nuclear power plant, situated in the Russian-controlled area of Enerhodar, seen from Nikopol in April 27, 2022. (ED JONES/AFP via Getty Images)

A Ukrainian Emergency Ministry rescuer attends an exercise in the city of Zaporizhzhia on August 17, 2022. (DIMITAR DILKOFF/AFP via Getty Images)

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Biden has used the Presidential Drawdown Authority at least 18 times to assist Ukraine — totaling more than $7.2 billion in defense equipment and services — since August 2021, to help bolster Ukraine’s defenses against Russia’s invasion.

"Through this process, the United States is providing Ukraine vital military assistance to defend itself against Russia’s unprovoked and brutal aggression, which amounts to internationally condemned war crimes," the State Department said in a press release last month.

The Zaporizhzhia Nuclear Power Plant in Enerhodar, Zaporizhzhia Region, is seen through barbed wire on the embankment in Nikopol, Dnipropetrovsk Region, central Ukraine. (Dmytro Smolyenko/ Ukrinform/Future Publishing via Getty Images)

The Zaporizhzhia Nuclear Power Plant is situated on the bank of the Kakhovka Reservoir formed on the Dnipro River, Enerhodar, Zaporizhzhia Region, southeastern Ukraine, July 9, 2019. (Dmytro Smolyenko/Future Publishing via Getty Images)

The assistance does not need congressional approval and can be sent within days or hours after Biden OKs the action, the State Department has previously said.

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The sizable figure comes as Congress has steadily increased the cap for the drawdown, from $100 million to $11 billion in recent years.