Contracts that semi-autonomous Kurdish authorities have signed with private oil firms are illegal until they are ratified by the Oil Ministry in Baghdad, the Iraqi government has reaffirmed.

Oil minister Hussain al-Shahristani also rejected paying firms that have developed the Taq Taq and Tawke oil fields in northern Iraq as part of contracts signed independently with the Kurdish Regional Government (KRG).

'These contracts need to be ratified by the Iraqi federal Oil Ministry. Till that time they are illegal,' government spokesman Ali al-Dabbagh told reporters at a news conference with Al-Shahristani.

After the conference, Shahristani told reporters: 'We will not discuss any compensation for these companies (developers of Taq Taq and Tawke) under any circumstances.'

His statement could ratchet up tensions between Baghdad and the KRG, which has said it would not pay Norway's DNO International, Toronto-listed Addax Petroleum and Turkey's Genel Enerji, from its own purse. Genel is to merge with Britain's Heritage Oil.

Shahristani said the KRG should pay the firms from the 17 percent of the federal budget it gets each year, an option ruled out by Kurdish natural resources minister Ashti Hawrami.

The Iraqi government at the beginning of the month allowed crude to start being exported from Tawke and Taq Taq.

That seemed to represent a break in a long-running dispute between the Shi'ite Arab-led government in Baghdad and minority Kurds over land, power and Iraq's vast oil resources.

But while giving a nod to exports, Baghdad still refused to recognise the actual development contracts signed with the firms, making it unclear how DNO and the others would be paid.

The central government says all oil deals must be approved by the Oil Ministry and opposes the production sharing agreements favoured by the Kurds.

Instead, Baghdad at the end of this month will announce the results of its first tender for fixed-fee service contracts in some of its prized oil fields.

Some lie near the disputed city of Kirkuk, contested by Kurds, Arabs and ethnic Turkmen. Hawrami has said the KRG would reject any deals for those fields if it did not like the terms.

'No one has the right to veto the decisions of the central government, whether those are decisions about oil or about anything else,' Shahristani retorted on Wednesday.

Shahristani has defended his record against criticism that Iraq's oil output of 2.3-2.4 million barrels per day remains at below the level it was at before the 2003 U.S.-led invasion. He faces calls to testify before parliament.

The joint news conference with Dabbagh appeared to be a signal that the government intended to stand by Shahristani as he prepares to announce the results of the first round of service contract tenders over two days on June 29/30.

Dabbagh said he hoped new oil and gas laws - held up in parliament - will resolve the issue of oil deals.

In a conciliatory tone that suggested the government's stance could be softening despite its rhetoric, Dabbagh also said the launch of Kurdish crude exports was good for Iraq, which desperately needs money to rebuild after years of war.

'It will narrow the gaps between the different points of views,' he said.-Reuters