Reasoning with the IASF
The Torkham highway links Peshawar with Kabul (and northern parts of Afghanistan and Central Asian states), and today 20 heavy trucks, oilers in particular, are sitting at Torkham. In Pakistan, not Afghanistan.
The US has run up the tempo, violence and depth of its ground and missile attacks in North and South Waziristan tribal regions in the past weeks, and now their southern supply line has been administratively interdicted.
Maybe the NeoCons will get the Russians to give them even more access to the northern supply line, for a song.