The Swiss Federal Tribunal, Switzerland’s highest court, has ordered Israel to pay $1.1 billion plus interest to Iran in a decades-old dispute over a secretive oil pipeline predating Iran’s 1979 Islamic revolution. The verdict was dated June 27, while media broke the story late last week.

Until the Islamic revolution and the fall of the Pahlavi dynasty in 1979, Israel and Iran maintained close ties. In fact, after the Six-Day War (1967 Arab-Israeli War), Iran supplied a large part of Israel’s oil demand while Israel returned the favor.

When Egypt blocked the Suez Canal, making Iranian oil transport impossible to Europe by tanker, Israel allowed Iranian oil to be shipped 158 miles (254 km) to the Mediterranean Sea via the Eilat-Ashkelon pipeline where it could unload at Eilat, a Red Sea port, then delivered to European markets.

The pipeline was a project of the Eilat-Ashkelon Pipeline Company (EAPC), an Israeli-Iranian joint venture set up in 1968. The joint venture pipeline was operational for a decade though it never reached maximum capacity of handling 60 million tons of crude per year.

According to the EAPC corporate website, the pipeline system serves as a land bridge for transporting crude oil from the Red Sea to the Mediterranean and vice versa. The crude oil pipeline system consists of three separate pipelines.

After the fall of the Shah of Iran, however, Israel and Iran became the region’s most stringent antagonists and bitter enemies. In the ensuing years, EAPC grew into a large energy company with considerable assets, now mostly handling oil from former Soviet states. EAPC is the largest oil distributor in Israel and is closely controlled by the Israeli government.

Iran first pursued the arbitration case in 1994 in France, then in Switzerland, demanding its share of the company’s revenues and assets that remained in Israel.

Israeli media said that Iran had tried for years to recoup its disputed assets from EAPC, despite decades of refusing to recognise Israel.

Israel Haymon News said that it remains unclear whether Israel will pay up, given its laws restricting “trading with the enemy.” Lawyers from both countries have failed to comment on the verdict.

•Photo shows oil pipelines.