Iraq's oil exports have so far been unaffected by the escalating violence and closure of the country's largest oil refinery.
The exports are already confined to the country's southern terminals, after violence in the north shut the export pipeline there in March.
Iraq has been expanding its southern oil production since Western companies signed a series of service contracts with Baghdad in 2010.
Exports from Iraq's southern terminals reached 2.58 million barrels per day in May, the oil ministry said, the highest since at least 2003.
The Foreign Secretary has been clear on the threat of Isis, but he has ruled out the prospect of any UK military involvement in the crisis.
Iraq’s foreign minister, Hoshyar Zebari, is a natural diplomat. Polite, immaculately dressed, and blessed with a great memory.
Isis has paraded military equipment in Mosul it captured from when the Iraqi army fled in what some see as a "nightmare scenario."