Social media-leaked U.S. documents allegedly reveal preparations for Ukraine’s spring offensive against Russia, prompting a Pentagon investigation.

Three photos of presentation transparencies labeled “Secret” and one photo labeled “Top Secret” were uploaded to Telegram as part of the plans.

“We are aware of the reports of social media posts, and the Department is reviewing the matter,” said Sabrina Singh, Pentagon deputy press secretary, according to the New York Post,

According to the Post, the plans outline preparedness for nine Ukrainian brigades and various military assets.

Unannounced deployment of nearly 100 special operations forces from NATO nations, including the United States, Britain, France, and Latvia, is indicated by the presentation slides.

The Post reported that an unnamed U.S. source told it that the documents were a compilation of authentic Pentagon documents and other information.

According to The New York Times, the documents understate the number of Russian combat fatalities.

The Times reported, citing unnamed military analysts, that “the modifications could point to an effort of disinformation by Moscow.”

However, the release of original documents “represent a significant breach of American intelligence in the effort to aid Ukraine,” the Times wrote.

The Times reported that the original U.S. documents clarify the rate at which Ukraine extends munitions for the U.S. rocket system HIMARS.

“Whether these documents are authentic or not, people should take care with anything released by Russian sources,” Michael Kofman, director of Russian studies at CNA, a research institute in Arlington, Virginia, said, according to the Times.

According to Newsweek, the documents indicate that the Ukraine offensive will commence this month. Last month, U.S. Defense Secretary Lloyd Austin stated that Ukrainian attacks on Russian forces could be successful.

“I think we’ll see an increase in fighting in the spring as the conditions for maneuver improve, and based on the things that we’ve done and continue to do. I think Ukraine will have a very good chance of success,” Austin told the Senate Armed Services Committee, according to Newsweek.

According to the New York Post, Mykhailo Podolyak, an advisor to Ukrainian President Volodymyr Zelenskyy, has cast doubt on the veracity of the documents.

“If you have a working channel for receiving intelligence from the Pentagon, you will not destroy it for a one-day information drive. If you have information about the level of support and military plans of the enemy, you will pretend that you do not have it. If you try to pretend you know, then you don’t know anything,’ Podolyak wrote on Telegram.

“This is a ruse; there is dust in your irises. You do not own the data, but you are attempting to play destabilization and influence decision-makers informationally and psychologically.

“As for the real plans of the counteroffensive — Russian troops, without a question, will be the first to become acquainted with them. I suppose that this may happen very soon,” Podolyak said.