GENEVA, March 9 (Reuters) - A Turkish politician was found guilty on Friday by a Swiss criminal court of denying that mass killings of Armenians by Ottoman Turks in 1915 amounted to genocide, the first such conviction under Swiss law.

Dogu Perincek, head of the leftist-nationalist Turkish Workers' Party, called the Armenian genocide "an international lie" during a speech in the Swiss city of Lausanne in July 2005.

Judge Pierre-Henri Winzap sentenced him to a 90-day suspended jail term and fined him 3,000 Swiss francs ($2,461), in line with the prosecutor's request, the Swiss news agency ATS reported from the Lausanne criminal court.

Perincek, who submitted 90 kg (200 lb) of historical documents, argued there had been no genocide against Armenians, but there had been "reciprocal massacres".

The 65-year-old politician, whose party has no seats in the Turkish parliament, was convicted under a 1995 Swiss law which bans denying, belittling or justifying any genocide. The maximum penalty is three years.

Twelve Turks were acquitted of similar charges in 2001.

The case has further soured relations between neutral Switzerland and Turkey, which denies any genocide during the disintegration of the Ottoman Empire in World War One.

Armenia says around 1.5 million Armenians perished in the killings, while Turkey says the deaths were part of inter-ethnic fighting, disease and famine in which both sides suffered.

Ankara was incensed last year when France's parliament approved a bill that made it a crime to deny the Armenian genocide. The bill did not become law.

The U.S. Congress is widely expected to back a resolution next month recognising the killings as genocide. The Bush administration is opposed to the move, fearing the impact on relations with its NATO ally.

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