A video has emerged online that appears to show a Syrian rebel with his fellow comrades in a room in front of a rebel flag. In the 30-second clip, a few men can be seen singing when one of them takes out his phone to click a selfie. Then a sudden blast follows after which they can be heard saying "Allahu Akbar" (meaning God is great). The footage has not been verified but appears to show members of the Free Syrian Army. Watch: Earlier this week, the Russian Defence Ministry called on the Free Syrian Army to stop fighting Kurdish units in the run-up to a cessation of hostilities in Syria and said it was considering a Syrian military request to supply ceasefire monitoring gear. The ministry made its comments in a Moscow news conference after an emboldened President Bashar al-Assad vowed to take back all of Syria, hours before the start of a Russian and American-backed ceasefire, which Assad's opponents described as stacked in his favour. The Russian Defence Ministry said the ceasefire, which it said would start at 1600 GMT, would be monitored using drones and that the Syrian army had said it was ready to diligently do its bit to uphold the agreement. Lieutenant-General Sergei Rudskoi, a senior Russian Defence Ministry official, said Moscow was considering a Syrian military request to supply equipment that would allow Damascus to monitor artillery fire in and around Aleppo. The ministry said Moscow would continue its own air strikes against Islamic State and the militant group formerly known as Nusra Front. It said a joint US-Russian coordination centre was being set up to determine Russian and US-led coalition targets.