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Saudi Arabia.
The Persian Gulf or the eastern Mediterranean's economy is most dependent on the export of oil.
For most OPEC nations, oil is their only or by far most valuable export. In order to cut off oil exports, they would have to endure large domestic spending cuts, which many are not willing to do.
Russia exports the most oil.
Venezuela's main exports are oil and petroleum. 80% is oil.
oil and metal are Russia's key exports.
Siberia exports machinery, gas and oil.
Currently two important economic activities in the Nordic nations are fishing and energy (oil and gas exports, hydropower, wind turbines).
Oil
the oil
oil
the oil