GENEVA/AMMAN (Reuters) - A delegation from Syria’s main opposition group arrived in Geneva on Saturday to join U.N.-mediated peace talks, demanding President Bashar al-Assad’s government be made to comply with a U.N. resolution on humanitarian aid and human rights.

“We are keen to make this negotiation a success,” opposition spokesman Salim al-Muslat told reporters as the delegation arrived from Riyadh, ending weeks of uncertainty about whether they would come and the talks would happen.

The 17-strong team from the Saudi-backed Higher Negotiation Committee (HNC), including political and militant opponents of Assad in the country’s 5-year-old civil war, is expected to have a first meeting with the U.N. mediator Staffan de Mistura on Sunday, setting up the first peace talks in two years.

Muslat said the HNC insisted on implementation of a U.N. resolution demanding all sides allow aid access, release detainees, end sieges and stop targeting civilian areas.

That was not a precondition for talks, he said, but it was the duty of the Security Council members who agreed the resolution last month, including Syria’s chief ally Russia, which is supporting Assad’s forces with a bombing campaign.

Russian air strikes on Syria have killed nearly 1,400 civilians since Moscow started its aerial campaign nearly four months ago, the Syrian Observatory for Human Rights, a monitoring group, said on Saturday.

“We are going to Geneva to put to the test the seriousness of the international community in its promises to the Syrian people and to also test the seriousness of the regime in implementing its humanitarian obligations,” HNC spokesman Riyad Naasan Agha said.

“We want to show the world our seriousness in moving toward negotiations to find a political solution,” he told Reuters.

Opposition coordinator Riad Hijab, who was not among the first HNC group to arrive, said in a statement posted online that there would have to be humanitarian improvements to justify the delegation’s continued presence in Geneva.

French Foreign Minister Laurent Fabius said the talks must ensure human rights are upheld as participants work toward a political transition in Syria.

“Humanitarian law must be respected and the objective of a political transition actively pursued to enable the talks to succeed,” Fabius said in a statement sent to Reuters.

Russian Deputy Foreign Minister Gennady Gatilov was quoted by Russian Interfax news agency as saying that Moscow welcomed the decision by Syrian opposition coordinator, Riad Hijab, to take part in talks in Geneva.

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U.N. SETS OUT AIMS

The United Nations earlier said the aim would be six months of talks, first seeking a ceasefire, later working toward a political settlement to a war that has killed more than 250,000 people, driven more than 10 million from their homes and drawn in global powers.

German Foreign Minister Frank-Walter Steinmeier told the German newspaper Welt am Sonntag: “Only at the negotiating table will it become clear if both sides are prepared to make painful compromises so that the killing stops and Syrians have a chance of a better future in their own country.”

The HNC’s demands include allowing aid convoys into rebel-held besieged areas where tens of thousands are living in dire conditions.

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The medical charity Medecins Sans Frontieres (MSF) said on Saturday that 16 people had starved to death in the government-besieged town of Madaya since aid convoys arrived this month and accused the authorities of blocking medical shipments.

“It is totally unacceptable that people continue to die from starvation, and that critical medical cases remain in the town when they should have been evacuated weeks ago,” said Brice de le Vingne, MSF’s director of operations in a statement.

Agha said the opposition delegation, including HNC head Hijab and chief negotiator Asaad al-Zoubi, would not call for a complete cessation of hostilities but would demand an end to “the indiscriminate shelling of markets, hospitals and schools by the regime and its Russian backers”.

Russia and Syria deny targeting civilians, saying they take great care to avoid bombing residential areas.

Separately, the heavy Russian bombing campaign continued unabated in northern Syria on Saturday with the Syrian Observatory for Human Rights saying the areas hit included rebel-held villages and towns in the Aleppo countryside near the border with Turkey.

AIR STRIKES AND SHELLING

Russian air strikes were also reported by the group in Hama province and in the eastern province of Deir al Zor where scores of people were killed in the aerial attacks on Islamic State- controlled towns in the territory that also borders Iraq, according to residents.

At least 40 people, including women and children, were injured when the army shelled a camp where over 3,000 displaced people had taken shelter, according to a rebel spokesperson from the First Coastal Division brigade who spoke from the area along the Turkish border in northwestern Latakia.

Heavy clashes also continued in the Latakia countryside where the Syrian army backed by intensive Russian carpet bombing in the rugged mountainous area allowed the government to regain most of the countryside close to the coastal heartland of Assad’s Alawite sect.

In separate comments before heading to Geneva, Zoubi said U.S. Secretary of State John Kerry gave assurances by phone to the HNC’s leadership, saying Washington supported a U.N.-backed political transition period without Assad, a bone of contention among warring parties.

The HNC also has been under pressure from mainstream armed groups represented within it not to give in to Western pressure, with some rebel groups already threatening to pull out of the body.