ISLAMABAD — The cost of the U.S.-led war effort in Afghanistan is about to rise by $365 million annually under an agreement that would reopen a key NATO supply route through Pakistan that’s been closed for nearly six months.

The accord, which the Pakistani government announced late Tuesday, would revive the transport of vital supplies of food and equipment from Pakistani ports overland to land-locked Afghanistan.

In return, the U.S.-led coalition will pay Pakistan a still-to-be-fixed fee of $1,500 to $1,800 for each truck carrying supplies, a tab that officials familiar with negotiations estimated would run nearly $1 million a day. The officials requested anonymity because they weren’t authorized to reveal details of the deal.

Pakistan closed the land route to supplies headed to the coalition after American aircraft mistakenly attacked two Pakistani border outposts Nov. 26, killing 24 Pakistani soldiers. Since then, supplies for coalition forces in Afghanistan have passed through one of two routes that stretch from Afghanistan through central Asia and Siberia to Georgia on the Black Sea. One of the routes is nearly 6,000 miles long. The Pakistan route is less than 500 miles.

Officials in Washington said they didn’t know how much of the new cost the United States would bear. As the United States contributes more than two-thirds of the 130,000-strong international force, which operates under the command of NATO, it’s expected that Washington will pay most of the new fee.

In return, the U.S. is asking Pakistan to provide security for the supplies, which are trucked through the country by private local transport companies, and much speedier clearance of customs and checkpoints. Militants and robbers frequently attack trucks carrying NATO goods. No effective security had been provided in the past.

Before the Pakistan route was suspended, 30 percent of coalition supplies passed through the country, according to the Pentagon.