Protesters hold up placards during a protest in front of the United Nations Headquarters in Beirut, Lebanon, Sunday, May 1, 2016.

UN Secretary-General Ban Ki-moon on Monday urged Russia and the United States to put Syria’s ceasefire back on track and stressed that new truce arrangements in place for two areas must be extended to Aleppo.

Heavy air strikes hit rebel-held east Aleppo in the early hours of Monday, days after the United States and Russia announced plans to reinforce the February 27 truce in Latakia and Damascus regions.

Ban is “profoundly concerned about the dangerous escalation of fighting in and around Aleppo and the intolerable suffering, counted in mounting deaths and destruction, it is causing among civilians,” said UN spokesman Stephane Dujarric.

The UN chief noted the re-launch of the cessation of hostilities in Damascus and Latakia and stressed “the need to expand these arrangements to other parts of Syria, with a special urgency for Aleppo.”

The appeal came on the eve of talks between Ban’s envoy for Syria, Staffan de Mistura, and Russian Foreign Minister Sergei Lavrov in Moscow on the collapsing ceasefire.

‘New initiatives’

Meanwhile, British Foreign Secretary Philip Hammond said on Monday he was deeply concerned about the state of the ceasefire in Syria and that a new initiative was needed to keep dialogue alive, after a sharp escalation of violence in the city of Aleppo.

“There is a need for a new initiative in the Syria dialogue to keep it alive, the Syrian moderate opposition is finding it increasingly difficult to justify their participation in a political process,” Hammond told reporters during a visit to Mexico City.

More than 270,000 people have been killed since Syria’s conflict erupted in March 2011 with protests demanding that leader Bashar al-Assad step down.

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