WASHINGTON, April 13. /TASS/. The "modest territorial gains" that the US expects from Kiev’s upcoming offensive make Ukraine question Washington’s support of its objectives, Politico writes, citing sources.

The Washington Post reported earlier that an assessment from early February, labeled "top secret," warned of significant "force generation and sustainment shortfalls," and the likelihood that Ukraine’s offensive operation would result in only "modest territorial gains."

"It gives us grounds for suspicion" of how seriously the United States backs Kiev’s objectives, a Ukrainian Defense Ministry official said.

"The same people who said Kiev would fall in three days are now leaking harmful and equally ridiculous information ahead of an offensive critically important for the entire free world," a person in regular contact with senior Ukrainian officials said, as cited by Politico.

Earlier, the Pentagon and the US Department of Justice launched a probe into the leak of secret documents about Washington and NATO’s plans to train Ukrainian soldiers ahead of a counteroffensive. Numerous documents on the schedules of arms supplies and the strength of forces were leaked to social networks, including Twitter and Telegram. The New York Times reported on April 7 that another batch of secret American documents related to Ukraine had appeared on the Internet. According to Reuters, the leaked documents may have been doctored. They concern plans by the US and NATO to prepare the Ukrainian armed forces for a counteroffensive. Numerous files revealing information about weapons supply schedules and the number of troops were posted, particularly to Twitter and Telegram. The news agency points out that this could be the biggest leak since over 700,000 files, videos and diplomatic cables appeared on the Wikileaks website in 2013.