Oil prices rose on Tuesday on rising disruptions from the Iran-Israel conflict, although major oil and gas infrastructure and flows have so far been spared from any substantial impact. Brent crude futures climbed $1.

Israel hasn’t attacked Iran’s energy export hubs so far. If it does, China could find itself cut off from a flow of cheap oil. Iran exports around 1.7 million barrels of crude a day, less than 2% of global demand.

The dramatic escalation in tensions between Israel and Iran caused a spike in the price of crude and raised fears among oil traders about disruption to shipping in the Strait of Hormuz, one of the world’s most vital waterways.