Syrian President Bashar al-Assad said on Saturday he was ready for a ceasefire, on condition that "terrorists" did not use a lull in fighting to their advantage, and that countries backing insurgents halted support for them.
"We have said that we are ready to stop military operations, but the issue relates to more important factors ... such as preventing terrorists from using it to improve their positions," an official online media outlet for the Syrian presidency quoted Assad as saying.
He said any truce must ensure that "other countries, especially Turkey, are prevented from sending more terrorists and weapons, or any kind of logistical support".
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Opposition ready for truce 'in principle'
The main Syrian opposition group said Saturday it is ready "in principle" to implement a provisional truce, slamming Russia and the Syrian government after a deadline set for a temporary cessation of hostilities passed.
The Saudi-backed group known as the High Negotiations Committee said any potential truce would require the Syrian government to first lift blockades from rebel-held communities and release thousands of detainees.
The statement followed a meeting among opposition groups held in the Saudi capital, Riyadh, on Saturday to discuss the situation after the passing of a deadline set by world powers including Russia and the U.S.
A Feb. 12 meeting in Munich of 18 nations supporting opposing sides in Syria's five-year civil war agreed to bring about a cessation of hostilities within a week to allow for peace talks to resume in Geneva. But the truce never took hold amid intense fighting, including a massive Russian-backed government offensive near the Turkish border.
UN envoy Staffan de Mistura told the Swedish newspaper Svenska Dagbladet on Friday that he cannot "realistically" get the parties in the Syrian conflict back to the table by Feb. 25, as he had hoped.
U.S. Secretary of State John Kerry spoke with Russian Foreign Minister Sergei Lavrov on Saturday about the progress made by two UN task forces meeting in Geneva this week to discuss humanitarian assistance and a cessation of hostilities, according to State Department spokesman John Kirby.
Although the details "are not yet fully agreed upon," Kerry expressed his hope that a full cessation of hostilities could be achieved in the shortest timeframe possible, Kirby said.
The HNC said any truce must include all parties to the conflict — notably Russia and Iran, key supporters of Syrian President Bashar Assad's government. Russia has said that it would continue to strike at "terrorists" in Syria even during a cease-fire.
'Disdain for the international community'
"The deadline set in Munich for a cessation of hostilities has passed without response from Russia or the regime, who show disdain for the international community and disregard for the lives of Syrians," said HNC spokesman Salem Al Meslet in a statement.
He said Assad and Russia have spent "yet another week annihilating defenceless Syrians" and called on the international community to implement a new approach that holds them to account.
Saudi Arabia's foreign minister, meanwhile, said he favours equipping Syrian rebels with surface-to-air missiles to "change the balance of power on the ground."
In an interview with the German weekly Der Spiegel published Saturday, Foreign Minister Adel al-Jubeir said the moderate opposition could "neutralize" helicopters and aircraft that have been bombing them. He said the move would have to be studied carefully, "because you don't want such weapons to fall into the wrong hands."
The U.S. has long opposed equipping rebels with such weapons, fearing they could end up in the hands of extremist groups, which could potentially use them to shoot down passenger planes.
Al-Jubeir said it's a decision that the international coalition will have to make.
"This is not Saudi Arabia's decision," he said.
Meanwhile, the spokesman for Russian President Vladimir Putin said the Kremlin is disappointed by the rejection of a proposed United Nations resolution aimed at stopping cross-border shelling and foreign ground intervention in the Syrian conflict.
The draft resolution was put forth by Russia on Friday at an emergency meeting of the UN Security Council and was immediately turned down by France.
Turkish strikes 'unacceptable': Russia
It did not name Turkey but it was clearly aimed at the Turkish government, which has threatened ground action and is shelling U.S.-backed Kurdish militia positions in Syria.
On Saturday, Kremlin spokesman Dmitry Peskov said, "Russia views such trans-border strikes by Turkish artillery and artillery strikes at Syrian territory as unacceptable," according to the state news agency Tass.
"We can only express our regret that this draft resolution was not supported," he said.
Syria's government, meanwhile, described the Turkish artillery shelling inside Syria as an "outrageous violation" of international law.
Turkey has been shelling Kurdish militia positions in Syria in recent days, saying it is exercising its right to self-defence and responding to fire from Syrian soil. It has also threatened to send in ground forces.
Kurdish group denies firing at Turkey
The main Kurdish group in Syria, the People's Protection Units, or YPG, has denied firing at Turkey from Syria. The group has been on the offensive near the Turkish border, seizing territory from Turkey-backed Syrian rebels as well as the extremist Islamic State group.
Turkey views the YPG as an extension of the Kurdistan Workers' Party, or PKK, which has waged a decades-long insurgency against Ankara.
The Kurdistan Freedom Hawks (TAK), a group that once had links to the PKK, on Friday claimed responsibility for the bombing. However, Davutoglu said that did not rule out the responsibility of the YPG, calling the TAK a "proxy" that claimed the bombing to shield the international reputation of the Syrian Kurdish fighters.
The YPG dominates a military alliance made up of Kurdish, Arab and Christian fighters known as the Syria Democratic Forces, which on Friday captured the town of Shaddadeh, in northeastern Syria, after three days of battles with ISIS militants. The town was one of the biggest strongholds of the extremist group in Syria.
The capture of Shaddadeh was reported Friday by the SDF as well as by Syrian activist groups opposed to Assad.
A militant website affiliated with ISIS disputed the reports, saying the militants were still in control of the town. A statement published by the Aamaq news agency said fighting was still raging around the town, with Kurdish units trying to advance under U.S. air cover.
Turkey calls on U.S. for support
Turkish Prime Minister Ahmet Davutoglu on Saturday called on the United States to give unconditional support in the fight against the YPG, illustrating growing tension between Ankara and Washington over policy in northern Syria.
Washington, which does not consider the YPG a terrorist organisation and is in fact backing it in the fight against ISIS, has said it is not in a position to confirm or deny Ankara's charge the militia was behind the bombing.
"The only thing we expect from our U.S. ally is to support Turkey with no ifs or buts," Davutoglu told a news conference following a five-hour security meeting with members of his cabinet and other officials. "If 28 Turkish lives have been claimed through a terrorist attack we can only expect them to say any threat against Turkey is a threat against them."