“One can only speak about the ceasefire revival only on the collective basis,” Lavrov said in an interview with a Russian TV news show on Saturday.

The top Russian diplomat said “Russia’s unilateral concession” is not enough for the revival of the truce.

On September 9, Russia and the United States agreed on a milestone deal on the Syrian crisis after some 13 hours of marathon talks in the Swiss city of Geneva.

The deal, which began on September 12 and was initially agreed to last seven days, called for increased humanitarian aid for those trapped inside Aleppo.

The Syrian army announced an end to the week-long ceasefire on September 19, when US-led coalition jets attacked a Syrian army base and an aid convoy was hit near the northwestern Syrian city of Aleppo.

Lavrov also called for an investigation into the airstrike targeting the humanitarian aid convoy which killed some 20 people.

He further reiterated his calls for the separation of opposition forces from the Jabhat Fateh al-Sham militant group, formerly known as al-Nusra Front, adding that Moscow had recently observed that opposition militants had merged with Jabhat Fateh al-Sham.

Syria has been gripped by foreign-backed militancy since March 2011. Over the past few months, the Takfiri militants active in the Arab country have suffered major setbacks as the Syrian army has managed to liberate several areas; Press TV reported.

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