A broadcasting organization backed by the federal government has used Facebook to target ads at United States citizens, in potential violation of longstanding laws meant to protect Americans from domestic propaganda.

Radio Free Europe/Radio Liberty, which typically broadcasts to audiences in Europe, Asia and the Middle East, bought several ads on Facebook in recent days that were targeted at users in the United States. The ads included several human-interest stories about Russia and a graphic about NATO’s popularity. As with other state-funded media organizations, Radio Free Europe/Radio Liberty is mostly restricted by law from promoting its content in the United States except on request.

The ads that ran on the organization’s Facebook page were uncovered by a Syracuse University researcher, Jennifer M. Grygiel, who was able to view them because of a recent policy change by Facebook. In May, the social network began displaying more information about ads on its platform, including about where the ads were targeted and the buyers.

It is unclear how many people saw the advertisements, or for how long the broadcaster has been directing them to Americans. The organization, which is overseen by a person appointed during the Obama administration, said in a statement that it had purchased the ads, as well as ads in 14 other countries, to reach Facebook users who spoke specific languages.