Nato to discuss funding Afghan forces after pull-out
They insist there will be no change in strategy despite Sunday's co-ordinated attacks by the Taliban.
Nato has agreed to start handing over security to Afghan forces, leaving them in full control from the end of 2014.
The US is expected to ask international partners to provide up to a quarter of the costs of backing Afghan forces.
Washington is looking for other countries to pay up to $1 billion (£630 million) a year, while it provides around $3 billion a year in support.
The meeting is preparing for a summit of Nato heads of state being held in Chicago next month, where a final commitment on funding Afghan security is expected to be announced.
The BBC's defence correspondent Caroline Wyatt says one of Nato's toughest jobs now will be holding the military coalition in Afghanistan together as the alliance's combat mission draws to a close.
On Tuesday Australia announced that it was bringing home most of its troops almost a year earlier than expected.
Other nations in the coalition, including Canada, the Netherlands and France have already pulled their forces out of combat or speeded up their withdrawal.
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