Zarif says state will defend territory if attacked in wake of bombing on Saudi oil facilities
Oil cartel seeks to cool a price rally that has taken crude prices to a four-year high
Talks to end global oil glut fall apart as Iran insists it needs to recover from sanctions
Opec and non-Opec countries to discuss production freeze to counter oil glut
Oil minister says country should be left alone until production reaches 4m barrels a day
Iran president visits WEF to persuade foreign investors to return to his oil-rich country
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