KING KHALID MILITARY CITY (Saudi Arabia) (AFP) - US and Russian officials were to meet Saturday on Syrian opposition charges of truce violations by the regime but peace talks remain on course, US Secretary of State John Kerry said.

Asked at the end of a visit to Saudi Arabia whether indirect dialogue in Geneva between the Syrian regime and opposition could go ahead as planned on Monday, Kerry said: "Yes, it can."

"Our teams are meeting today with Russia in both Geneva and Amman, where very detailed lay downs will take place regarding these allegations and I am requesting a call with Foreign Minister (Sergei) Lavrov today and we will work through these and we have been each day," he said of the opposition complaints.

Air raids by the Syrian regime killed seven civilians in rebel-held areas of second city Aleppo on Friday, according to the Syrian Observatory for Human Rights.

The Britain-based monitoring group termed the strikes "the most serious violation in the city since the truce came into effect".

But Kerry, who met Saudi Arabia's King Salman for talks on Syria, said that "perceived" violations of the ceasefire that began on February 27 should not derail the UN-mediated talks.

"The level of violence by all accounts has been reduced by 80 to 90 percent, which is very, very significant. And what we want to do is continue to work to reduce these.

"We believe that the start of talks this next week in Geneva presents a critical moment for bringing the political solution to the table that we've all been waiting for, even as we extend the humanitarian assistance and continue to try to reduce the violence," he said.

Saudi Foreign Minister Adel al-Jubeir said: "I would emphasise that people see the future of Syria without (President) Bashar al-Assad."

On Friday, the Syrian opposition said it will attend the peace talks, stoking hopes that the war-ravaged country may be able to end five years of civil war and move towards elections in 18 months.

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- Ceasefire violations -

The two-week ceasefire has created a lull in fighting between the Russian-backed regime and non-jihadist rebels.

The UN Syria envoy called on Friday for elections in the war-ravaged country to be held by the middle of 2017.

The US State Department said the truce "has produced a dramatic reduction in violence", although it warned that the regime was still carrying out attacks.

"Despite the reduction in violence nationwide, we remain deeply concerned by continued specific violations to the cessation of hostilities, including attacks on civilians and opposition forces by the regime and its supporters," spokesman John Kirby said.

The Riyadh-based High Negotiations Committee, the main Syrian opposition grouping, agreed on Friday to attend the talks.

The HNC said it would focus on creating a "transitional governance body with full executive powers", while insisting Assad "will have no place" in a future government.

A plan agreed by world powers last year called for six months of talks followed by a transitional government, a new constitution and elections within 18 months.

Assad's regime announced last month that it would hold parliamentary elections on April 13 instead, sparking criticism.

Syrian Foreign Minister Walid Muallem told reports Saturday that the government delegation would travel to Geneva on Sunday.

UN envoy Staffan de Mistura has said the Geneva talks would be "substantive" and last no longer than 10 days.

"New elections... should be held 18 months from the start of talks, that is from March 14," De Mistura told Russia's RIA Novosti state news agency.

In addition to planning the polls, the focus in Geneva will be on the formation of "an inclusive new government" and a new constitution, he said.

Syria's complex war, which next week enters its sixth year, has killed more than 270,000 people and displaced half the population.

Russia on Friday urged the UN to include the Kurds, who have been a major force in fighting jihadists such as the Islamic State group.

Excluding them would be "a most serious infringement of the rights of a large and significant group living in Syria", Lavrov said.

The last round of UN-sponsored talks collapsed in February after the government began a fierce Russian-backed offensive around second city Aleppo.