Islamabad stopped NATO supplies travelling overland from its southern Karachi port to Afghanistan in November amid public outrage after 24 Pakistani soldiers were killed in a US air strike on a border post.
Western officials were keen for Pakistan to commit to reopening the supply lines to landlocked Afghanistan before a NATO summit in Chicago next month.
A new framework for engaging with the US approved by Pakistani lawmakers late on Thursday was silent on the resumption of NATO convoys but said Pakistani soil must not be used to transport arms or ammunition to Afghanistan.
Analysts said this condition - missing from an earlier draft of the framework - would not hinder the reopening of NATO routes, as the convoys were mainly used to carry "non-lethal" supplies.
"There is no past evidence that weapons were transported via Pakistan ground routes," Pakistani political analyst Hasan Askari told AFP.
"The US has other options to send weapons to Afghanistan - they can use the European channel, through Turkey and central Asia."
Brigadier General Carsten Jacobson, spokesman for the NATO force in Afghanistan, told AFP he would welcome the Pakistan route being reopened, but the operation was not dependent on it.
Political analyst and author Imtiaz Gul described the bar on transporting deadly weapons as "a gesture to address public opinion".
Pakistan-US relations nosedived in 2011, first over a CIA contractor who shot dead two Pakistanis in Lahore, then over the discovery of Osama bin Laden in Abbottabad and finally over the November air strikes.
Washington and Islamabad have taken steps recently to patch up their fractious relationship.
President Barack Obama met Pakistan's Prime Minister Yousaf Raza Gilani on the sidelines of a summit in Seoul last month and last week US Deputy Secretary of State Tom Nides held talks with Gilani and other ministers in Islamabad.
But the Pakistani public is deeply uneasy about the country's cooperation with the United States in the "war on terror" and retired Brigadier Saad Muhammad, a defence analyst, said significant political obstacles to reopening the supply lines remain.
"Parliament members had received death threats and resumption will be a loss of face for the ruling party," Muhammad, who served as Pakistani defence attache in Kabul, told AFP.
"There will be public reaction. Now it becomes a real problem for the Pakistan government to resume the supply."
"Religious and right-wing political parties were blaming the government for its pro-US policies and that was the reason that passing of this resolution took more time in the parliament," said political analyst Askari.
"Religious and right-wing political parties could use it against the ruling Pakistan People's Party in the upcoming elections."
The "no arms or ammunition" condition has cut no ice with some hardline groups opposed to NATO convoys.
The Difa-e-Pakistan Council, an alliance of right-wing, religious political parties and extremist groups who have campaigned against restarting the supply routes, has vowed to block convoys no matter what they carry.
"Americans used to supply arms and weapons using Pakistani routes and we fear that again they will start this practice taking the cover of (non-lethal supplies)," Israr-Ullah, a spokesman for the coalition, told AFP.
"It was a pre-planned decision and the text of this resolution was written by Americans."
It is also election year in the United States, and domestic political concerns may play a role in how Washington responds to another key demand made by the Pakistani parliament: an apology for the November air strikes.
The White House has so far voiced regret for the deaths but stopped short of apologising, and with Obama's likely Republican opponent Mitt Romney criticising the president for "apologising for America" it remains to be seen whether he will take the extra step.
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@Siraj: How do you run your home and feed your kids dear! on "Jazbaats" or money, how do you educate them , how do you plan their future and how do you fuel your transport and life. I HOPE SO >>>> ON JAZBAT>>>???
Dear Huzaifa, so all your concern will be soleved if they ( US ) give u money. Money Money Money your are great.
Dear Huzaifa, so all your concern we be soleved if they ( US ) give u money. Money Money Money your are great.
The resumption of NATO supply is imortant for Pak-US relations as no other alternate is availble for both of us. The huge US embassy planned in Islamabad shows the projected future interest in Pakistan. Pakistan has some important issues which could be resolved with the help of US but "THE MUSH" era pushed Pakistan down rightly on the knees. We became loyal servants to the low level US administration, one visit by under-under-under secretary of state use to bring whole of the administration on the knees. I think now is the time and space, history has provided us that we can prop up our "NATIONAL INTEREST" besides mighty US INTEREST. We must ask India similar Nuclear deal if US wants us to back down from IRANIAN pipeline, we must ask for an immediate release of hard earned CSF fund, we must ask for immidiate release of multi billion Rs renumeration for damage to our road infrastructure, we must ask for removal of Indian counsalates from immidiate vicinity of our borders. Most important that we must ask a heavy heavy blood money for the shahadats of our soldiers that next time US send war planes to bomb our soldiers she has to draw out a calculator to knpw the finnancial implications of that step.