The preliminary agreement may not have an immediate effect on prices at the pump. Damaged infrastructure and risky transport could keep costs up.

© Jenny Kane/Associated Press

The Iran war is pushing countries to prioritize domestic energy in order to protect themselves from volatile oil and natural gas markets.

The Iran war is pushing countries to prioritize domestic energy in order to protect themselves from volatile oil and natural gas markets.

© Jes Aznar for The New York Times

An analysis of oil export data offers clues about which nations have benefited from higher prices, and which have lost a lot of revenue.

© The New York Times