US President Barack Obama is due to meet Afghan President Hamid Karzai for talks expected to focus on US troop levels in the country after 2014.
One of Mr Obama's former advisers on Afghanistan, Lawrence Korb, explained to Today presenter John Humphrys that President Karzai is going to be looking for answers on what circumstances will see US and Nato forces remain in the country.
He said Mr Karzai would also want to know "what conditions will apply for him to get the aid that has been promised and for how long the aid will continue".
Lucy Morgan Edwards, author of The Afghan Solution and former political advisor to the EU ambassador in Afghanistan, said there is no expectation that the two will sign a bilateral security agreement.
She also said that recent deaths among British forces can be put down to "failed strategy and unpopularity with what we have done since 2001".
"We have done things in our own way and failed to try to engage in what is locally legitimate and locally makes more sense," she added.
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