The Syrian response falls far short of US and European demands that Syrian forces stop fighting first - and even Russia's insistence that both sides lay down their arms simultaneously.
But it does leave the door open for talks, and Annan is sending a team to Damascus on Sunday to continue discussions on implementing his proposal to end the yearlong conflict. Annan said Friday that if the team makes sufficient progress he will consider returning to Damascus, where he held two rounds of talks last weekend with President Bashar Assad.
The Syrian letter asks Annan, the joint UN-Arab League envoy, "to provide guarantees to the Syrian government that the armed groups will cease all armed aggressions and give up their weapons to the dedicated authorities in exchange of a full pardon."
The Syrians said they want the "guarantees" because of "the lessons" they learned dealing with Arab League monitors.
The monitors were supposed to ensure Syrian compliance with an Arab League plan that Assad's government agreed to on Dec. 19 calling on Syria to remove heavy weaponry, such as tanks, from all cities, free all political prisoners and allow in human rights organizations and foreign journalists. But the monitors were withdrawn in late January amid heavy criticism that the Arab League mission had failed to stop the crackdown.
The Syrians said that when the Arab monitors were in the country and they withdrew all their forces from cities and other urban areas "the armed groups used their weapons and attacked the population as well as the public order police and destroyed (the) Syrian economy."
The letter, first reported by the Lebanese newspaper An-Nahar, also demanded from Annan that neighboring countries control the flow of arms through their borders, and that countries that have called publicly for weapons and financing for armed opposition groups stop doing so.
When Annan provides all these guarantees, "the Syrian government can discuss with him the idea of putting in place a neutral monitoring system," the letter said.
On the humanitarian front, a Syrian-led assessment team with technical experts from the United Nations and the Organization of Islamic Cooperation is scheduled to start visiting key cities affected by the uprising this weekend.
As far as Annan's request for a two-hour "temporary humanitarian ceasefire," Syria said "this would relate to the local situation evaluated by the Syrian party," in consultation with the Syrian Red Cross, the International Committee of the Red Cross and its foreign ministry.
Syria insisted that there have been no "random arrests" during the uprising and that a large number of prisoners with "blood" on their hands or criminal records have been released. The government said a decree has been signed pardoning all those who surrender weapons.
The International Committee of the Red Cross has visited the central prison in Damascus and the government said it is ready to organize another visit to the central prison of Aleppo.