US Vice President Joe Biden appealed to NATO allies on Tuesday to help the United States tackle worsening security in Afghanistan.
At a meeting of members of the 26-country military pact in Brussels, he said the deteriorating situation in the region poses a security threat "not just to the United States, but to every single nation round this table."
Afterwards, he told a news conference: "We are not now winning the war, but the war is far from lost."
NATO secretary general Jaap de Hoop Scheffer called on NATO to boost efforts before elections are held in Afghanistan on 20 August.
The Taliban is making advances in Afghanistan and gaining more influence in Pakistan. NATO supply convoys to Afghanistan have been disruped.