Mr Kateb said the steep export drop was revealed in a parliament report by Oil Minister Rostam Qasemi.

BBC: Iranian oil revenues 'drop 45%' because of sanctions

However, Iran's Oil Minister Rostam Qasemi said that a cut in exports to Europe would not hurt Tehran.

BBC: Iran 'halts oil sales to France and Britain'

The report quoted Iranian Oil Minister Rostam Ghasemi as noting the talks are continuing and provided no further details.

WSJ: North Korea Reaffirms Commitment to Nuclear Program

In an interview with the Iranian Student News Agency (ISNA), Gholam Reza Kateb a member of the national planning and budget committee in Parliament referenced a report from Iran's oil minister Rostam Qasemi.

CNN: Iran's oil revenue problem