“More than 100 classified documents relating to Ukraine, China, the Middle East, the Pacific, and terrorism are now believed to be in the public domain after they were posted in an obscure internet forum last month.
It comes after White House officials said they were investigating the appearance of highly classified briefing documents related to Ukraine on Twitter on Thursday.
The US Department of Justice said it had launched an investigation into the leak.
American officials said Russia or pro-Russian elements were likely behind the leak, but did not give further details.”
https://www.yahoo.com/news/us-hit-biggest-leak-secret-133851066.html