Kabul: French President Nicolas Sarkozy said France could boost its presence in Afghanistan to help the Afghan army and police in a surprise visit to give French troops his Christmas greetings.

"There is a war going on here, a war against terrorism, against fanaticism that we cannot and will not lose," he told reporters who accompanied him.

He said the French troops, currently 1,900, would help the Afghan army, police, administration and judiciary. Sarkozy said a decision on troop numbers was due in the next few weeks.

Taliban leader Mullah Omar on Tuesday called on foreign forces to withdraw from Afghanistan. Diplomats and the local military have called for a new strategy to fight the rebels.

"What is certain is that we have not wanted to give the signal of departure, that would have been a despicable signal at a time when one sees the ravages inflicted by terrorism in the world," Sarkozy said.

Britain, which has about 7,800 troops operating in Afghanistan, part of a 40,000-strong Nato stabilisation force, is expected to increase that number over time as it draws down in Iraq, but no formal announcement has been made.

British Prime Minister Gordon Brown has unveiled what he called a new framework on Afghanistan, with plans to provide assistance of about £450 million (Dh3.3 billion) between 2009 and 2012 and to bolster training of the armed forces.

New Australian Prime Minister Kevin Rudd also visited Afghanistan yesterday for meeting Australian forces who like the French troops serve under Nato's command and for holding talks with President Hamid Karzai.

Rudd, who was elected on November 24, spoke of his country's continued support for Afghanistan and pledged an additional $110 million for the coming two years for the central Asian nation.

Earlier in the day, Sarkozy held talks with Karzai and the two leaders said Afghanistan's poor security and opium production were its major challenges, the Afghan presidential palace said in a statement.