(CBS/AP) UNITED NATIONS - The U.N. Security Council delayed a vote on a new Syria resolution until Thursday in a last-minute effort to get key Western nations and Russia to agree on measures to end the dramatically escalating violence.
International envoy Kofi Annan urged the deeply divided council to postpone Wednesday's scheduled vote after a bombing in the heart of Syria's capital killed three top regime members, including the powerful brother-in-law of President Bashar Assad and the defense minister.
U.N. Secretary-General Ban Ki-moon, who was visiting China, urged the Security Council to "take collective action, with a sense of unity."
Ambassadors from the five veto-wielding permanent council nations the U.S., Russia, China, Britain and France met behind closed doors Wednesday morning to discuss Annan's request. Russia's U.N. Ambassador Vitaly Churkin told reporters afterwards that the vote had been postponed by a day, CBS News foreign affairs analyst Pamela Falk reports.
The key stumbling block to an agreement on a Syria plan is the Western demand for a resolution threatening non-military sanctions. It is tied to Chapter 7 of the United Nations Charter, which could eventually allow the use of force to end the conflict.
Russia, a close Syria ally, is adamantly opposed to sanctions and any mention of Chapter 7. Although Western nations appear to have little appetite for force, Russia fears a repeat of the NATO campaign in Libya.
Russia's Foreign Minister Sergey Lavrov pointed to Wednesday's deadly bombing and accused the West of inciting the Syrian opposition, arguing that a proposed U.N. resolution amounted to support for the rebels and would lead to more bloodshed.
Supporting the Syrian opposition "is a dead-end policy, because Assad is not leaving voluntarily," Lavrov was quoted as saying by the RIA Novosti news agency on Wednesday.
U.S. Ambassador Susan Rice said Wednesday's closed-door meeting by the five veto-wielding permanent council nations yielded no new proposals from Russia. France's U.N. Ambassador Gerard Araud expressed hope the Russians would come up with something new, but said he wasn't optimistic about Thursday's vote.
The mandate of the 300-strong U.N. observer force in Syria expires on Friday, and the Security Council must decide by then whether to extend it.
The U.S. and its European allies contend that the unarmed observers were authorized for 90 days to monitor a cease-fire and implementation of Annan's six-point peace plan and with violence escalating dramatically, they insist that there must be consequences for non-compliance.
Britain's foreign secretary insisted that the bombing in Damascus underscored the urgent need for a Chapter 7 resolution.
"The situation in Syria is clearly deteriorating. All the members of the U.N. Security Council have a responsibility to put their weight behind the enforcement of ... Annan's plan to end the violence," William Hague said in a statement.
White House spokesman Tommy Vietor said it's clear that Assad is losing control of his country.
"There is real momentum against Assad, with increasing defections, and a strengthened and more united opposition that is operating across the country," Vietor said, adding, "With the Assad regime losing control, it's time for the Syrian people and the international community to focus on what comes next. We are working urgently with our international partners to push for a political transition in Syria."
British Defense Minister Philip Hammond suggested that Russia and China hold the key to a peaceful solution because of their support for Assad.
"If those powers are sending clear messages about the limits of their tolerance for the activities of the regime, that will be an effective constraint on the activities of the regime," Hammond said at a Pentagon press conference with U.S. Defense Secretary Leon Panetta.
Panetta said "it is more essential than ever" that the U.S. and the international community work through the U.N. to bring pressure on Assad to step down.
There has been a lot of diplomatic scrambling to try to get council unity, which would send a much stronger signal to Syria.
A draft resolution supported by the Western powers would impose non-military sanctions against Assad's regime if it fails to withdraw troops and heavy weapons from populated areas within 10 days a key demand of the Annan plan. Moscow's rival proposal calls for the "immediate implementation" of Annan's plan and guidelines for a political transition approved at a meeting in Geneva last month, but makes no mention of sanctions.
Russia and China have incurred international criticism by twice vetoing U.N. resolutions to increase pressure on Assad.
A commentary that ran Tuesday in the official People's Daily newspaper strongly opposed using force against Syria a sign that China may again block the Western-backed resolution. It said "a political solution is the only way out of the Syrian problem."