US General David Petraeus appealed yesterday for a united effort to end almost nine years of war against the Taliban as he made his public debut as the commander of Nato forces in Afghanistan.

The four-star general, who arrived in the Afghan capital last Friday, faces a tough task to bring peace and secure a face-saving exit for allied troops fighting an increasingly deadly insurgency by the hardline Islamists.

"This is an effort in which we must achieve unity of effort and common purpose. Civilian and military, Afghan and international, we are part of one team with one mission," Petraeus said at the US embassy in Kabul.

"On this important endeavour, co-operation is not optional," Petraeus added. Petraeus, who took over as commander of the 140,000 US and Nato troops in Afghanistan after the sacking of US General Stanley McChrystal, has said the war is likely to get tougher before significant improvements are seen.

"This is a tough mission, there is nothing easy about it. But working together we can achieve progress and we can achieve our mutual objective," he told some 1,700 invited guests at a Fourth of July reception. Petraeus was due to formally assume his commander role today in a ceremony at Nato's International Security Assistance Force (ISAF) headquarters in central Kabul.

But he has already started on the job, leading yesterday's morning briefing of regional commanders across the country, said ISAF public affairs officer US Air Force Lieutenant Colonel Tadd Sholtis.

"He was actively engaged in asking questions and providing guidance to headquarters personnel and subordinate commands connected to the meeting," Sholtis said.

The general also met Afghan President Hamid Karzai yesterday, he said, though details of their encounter were not immediately available. Petraeus arrives as US and Nato soldier deaths are touching record highs in intensified fighting, along with questions about the wisdom of committing such huge resources in manpower and money to what could yet be a lost cause.

His appointment has been welcomed by local officials, including Karzai, who had the support of McChrystal despite frustration in the West over his commitment, particularly towards cracking down on corruption.

Analysts have urged Petraeus to make immediate adjustments to turn around rapidly a war seen as bogged down to the Taliban's advantage.

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