Recently leaked classified US Defense Department documents, regarding the ongoing Ukraine-Russia war, have been labeled "a very serious risk to national security" by officials. The documents, which include data on US allies and China as well, are reportedly formatted similarly to those issued to senior leaders for daily updates. Officials have stated that some of the documents may have been altered, but it is not known to what extent. Investigation into the source of the leak has begun, and the Pentagon has begun reassessing their document distribution process. Officials from the Pentagon, White House, and the Department of Justice are all involved in the investigation. In the weeks since the leak, Ukrainian officials have updated their military plans due to the sensitive information disclosed, and other documents discuss Indo-Pacific and Middle Eastern defense and security issues. The leak has raised concerns about the safety and security of US national security documents.