Secret U.S. and NATO plans to help Ukraine ahead of an expected counteroffensive this spring were leaked on social media earlier this week, prompting a Pentagon investigation, they said. New York Times This was reported by senior officials of the Biden administration Kyiv Independent.

The plans of the Americans were published on Twitter and Telegram, and the Pentagon is investigating who could have disclosed the documents, the NYT reports.

The documents do not reveal details about when, how and where Ukraine plans to launch a counteroffensive, and were drawn up five weeks ago.

According to military analysts interviewed by the NYT, it is likely that the documents were altered from their original format, underestimating Russian casualties and overestimating Ukrainian casualties.

Analysts told the NYT that the changes to the documents, while appearing genuine, may be part of a Russian disinformation campaign to distort the facts about the war in Ukraine.

One of the documents appears to detail the cost of US-provided HIMARS artillery systems, information that has been a closely guarded secret, while another describes the status of some Ukrainian combat brigades, including their equipment and when they might be ready to deploy. forces, notes the Times, cited by Business Insider.

However, the leak is a “significant violation of US intelligence efforts to help Ukraine,” the NYT writes.

Representatives of the Biden administration told the American newspaper that attempts to remove information from social networks have not yet been successful.

“We are aware of reports of social media posts and the department is looking into the matter,” the NYT quoted Pentagon Deputy Press Secretary Sabrina Singh as saying.