Russia’s track and field team is barred from competing in the Olympic Games this summer because of a far-reaching doping conspiracy, an extraordinary punishment without precedent in Olympics history.

The International Association of Athletics Federations, the governing body for track and field, announced the decision Friday, ruling in a unanimous vote that Russia had not done enough to restore global confidence in the integrity of its athletes.

Russia won 18 medals in track and field — including eight golds — at the last Summer Olympics. But when the Rio Games begin on Aug. 5, no track and field athletes will compete under the Russian flag. Not even East Germany, which conducted a notorious doping scheme throughout the 1960s, ’70s and ’80s, faced such a penalty.

“Politics was not playing a part in that room today,” Sebastian Coe, the head of the track and field organization, said about the vote Friday. “It was unambiguous.”