AMSTERDAM — The International Criminal Court on Monday sentenced Jean-Pierre Bemba, a former Congolese vice president who was acquitted of war crimes in June, to a 300,000 euro fine for witness tampering.

Mr. Bemba, who has been barred from running in the presidential elections in the Democratic Republic of Congo because of the conviction for witness tampering, was also sentenced to 12 months in prison, but that was reduced to zero because of time already served.

“Future accused persons can look at Mr. Bemba’s conviction as a cautionary example as to what consequences obstructing the administration of justice can have,” said Judge Bertram Schmitt. “Mr. Bemba’s acquittal in the main case should have been the end of his exposure to the court, yet he continues to have the specter of this institution hanging over him.”

The acquittal of Mr. Bemba on war crimes charges, which came on appeal, came as a surprise and raised the prospect he could return to Congo and re-enter politics. A final decision is expected Wednesday on whether the witness tampering conviction, for which he must pay the equivalent of $350,000, makes him ineligible to run.