Western leaders have hailed a decision by Syria's opposition to attend Wednesday's international peace conference alongside representatives of a regime they despise and remain determined to overthrow.
After weeks of hesitation and threats to boycott the talks, the deeply divided National Coalition said it will go to Switzerland, with the sole aim of toppling President Bashar al-Assad.
The so-called Geneva II meeting aims to set up a transitional government to end a brutal war estimated to have killed more than 130,000 people and forced millions from their homes in nearly three years.
US Secretary of State John Kerry hailed the opposition's "courageous" decision to attend the talks, describing it as a "path that will ultimately lead to a better future for all Syrians".
"We all know that the process ahead will be difficult, but I say directly to the Syrian people: we will stand by you every mile of the journey as you seek to achieve the freedom and dignity that all Syrians deserve," he said in remarks echoed by Britain, France and Germany.
Russia, too, hailed the announcement.
"That is the right decision, we have always said that one has to go to the forum and enter into dialogue with the government," Deputy Foreign Minister Mikhail Bogdanov told the state ITAR-TASS news agency.
"The work of the conference will be based on this, the main thing is the launch of inter-Syrian talks," said Bogdanov.
The Coalition voted Saturday by 58 to 14 to attend the peace conference in the Swiss town of Montreux, with only 75 of the around 120 delegates taking part in the secret ballot -- a sign that strong disagreement persists.
Coalition leader Ahmad Jarba said the group was going to Switzerland to remove the "butcher" Assad from power.
"The Geneva II negotiation table is a one-way road aimed at achieving all the demands of the revolution... and first and foremost stripping the butcher (Assad) of all his powers," he said.
The head of the rebel Free Syrian Army, General Selim Idriss, called for a "peaceful resolution" to the conflict, and urged the opposition to uphold the "goals of the revolution" and remove Assad and his allies from power.
The FSA, the armed wing of the Coalition has been greatly marginalised by the emergence of Al-Qaeda-linked jihadists and Islamist rebel brigades.
Coalition member Munzer Aqbiq said the opposition would form within 24 hours a delegation made up of diplomats, politicians, FSA representatives and legal experts.
The Coalition has been under intense pressure from its Western and Arab backers to attend the talks.
UN chief hails opposition participation
UN chief Ban Ki-moon on Sunday hailed the opposition's decision as a boost to efforts to halt the Syrian war.
"I look forward to the opposition's expedited formation of a delegation that broadly represents the diversity of the Syrian opposition, including women," added the UN Secretary General, who is the convenor of the conference.
Foreign Minister Walid Muallem said Damascus was determined to ensure the talks were a success, and sent a letter to the United Nations saying the conference is about tackling extremists.
More than 35 countries will gather in the Swiss cities of Montreux and Geneva from Wednesday for the peace talks.
The lead-up to the talks has been marked by rebel in-fighting on the ground in Syria, which in two weeks has killed nearly 1,100 people.
One of the groups, the Al-Qaeda-linked Islamic State of Iraq and the Levant (ISIL), on Sunday appealed for a halt to the skirmishing.
"Today, the (Islamic) state is reaching out to you to stop fighting us, to focus on fighting the nusairiyah," the voice in the message, purportedly that of ISIL chief Abu Bakr al-Baghdadi, said, using the term often used by jihadists to refer to the Syrian regime.
The remarks mark a shift for ISIL, which said earlier this month it would "crush" opposition fighters and considered members of the Syrian National Coalition and the military command of the Free Syrian Army to be "legitimate targets".
Meanwhile at least another 30 people died on Sunday in violence across the country, including 15 killed when regime planes dropped barrel bombs on rebel zones in the northern province of Aleppo, according to the Syrian Observatory for Human Rights.