Why are Iraq's Kirkuk oilfields so important?

BAGHDAD/ABU DHABI (Reuters) - Iraq's oilfields in the disputed Kirkuk region have taken on new significance after the United States restored oil sanctions against neighbouring Iran. Washington is pressuring Baghdad to resume exports that stopped last year.Iraq aims to raise its export capacity to 8.5 million barrels per day (bpd) in the coming years from less than 5 million bpd currently, 1 million of which could come via Kirkuk. But that resumption is not just a question of turning the tap back..