Lahore, Apr. 20 : While Pakistan, in its effort to convince the international community, has repeatedly said that it is sincere in thwarting the rising Taliban influence in the region, the United States believes that Islamabad does not have either the will, nor the capacity to pose a challenge for the extremists.

Terming Pakistan as a `big problem', US Senator Ted Kaufman has said that the country lacks both ability and capacity to counter the insurgents from expanding their writ inside its territory.