US President Barack Obama and Afghan leader Hamid Karzai on Tuesday discussed the details of Washington's new military strategy for the war-torn country, Karzai's office said.

The two presidents held an hour-long video conference to discuss aspects of the new strategy and "security, political, military and economic issues were discussed in detail", the palace said in a statement.

It gave no further details.

Obama is later Tuesday expected to announce deployments of up to 35,000 more troops to battle Taliban and Al-Qaeda militants, and to secure Afghan cities.

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