The tensions over Iran's nuclear program have pitted the West against the world's third-biggest oil exporter.
Here are details about Iranian oil.
_ OIL PRODUCTION: Nearly 4 million barrels per day, or 4 percent of the world's production.
_ BIGGEST BUYERS: China, Japan, India, Italy, South Korea.
_ IMPACT: Since tensions with Iran began escalating in November, benchmark oil prices have risen 15 percent.