At least three civilians and a Syrian soldier have been killed after clashes erupted between the Syrian army and the Kurdish-led and US-backed Syrian Democratic Forces (SDF) in Aleppo, according to the state news agency SANA. Earlier, Syria's defence ministry said three soldiers were injured after SDF fired drones at a military checkpoint near Deir Hafer, east of northern province. Heavy machine gunfire and fighting have been reported in the areas of Sheikh Maqsoud and Ashrafiyah. The ministry says it will respond to the "aggression in an appropriate manner".

Lebanese militant group Hezbollah announced Tuesday it had captured a fallen Israeli spy drone near the country's southern border with Israel, escalating tensions between the Iran-backed Shiite Muslim organization and its adversaries in Tel Aviv. Israeli military officials confirmed that a Skylark unmanned aerial vehicle or UAV had crashed Monday in Lebanese territory. The reconnaissance device landed near the town of Alma Shaab, according to Hezbollah-affiliated news outlet Al Manar. The lightweight drone is manufactured by Israeli defense manufacturer Elbeit Systems and costs around $50,000 per unit. The Lebanese Army reportedly attempted to recover the aircraft but was unable to do so due to harsh terrain.

Russian combat engineers arrived in Syria on a mine-clearing mission in the ancient town of Palmyra after it was recaptured from Islamic State of Iraq and the Levant (ISIL) this week. On Thursday, the Defence Ministry said sapper units were airlifted to Syria with equipment including state-of-the art robotic devices to defuse mines at the 2,000-year-old archaeological site. Russian television stations showed Il-76 transport planes with the engineers landing before dawn at the Russian air base in Syria. Sunday's recapture of Palmyra by Syrian troops under the cover of Russian air strikes was an important victory over ISIL fighters, who controlled the area for 10 months. Lieutenant General Sergei Rudskoi of the military's General Staff said Russian advisers helped plan and direct the Syrian army's operation to recapture Palmyra.

Russian combat engineers arrived Thursday in Syria on a mission to clear mines in the ancient town of Palmyra, the military said. The Defense Ministry said the sapper units were airlifted to Syria with an array of equipment, including state-of-the art robotic devices, to defuse mines at the 2,000-year-old archaeological site. Russian television stations showed Il-76 transport planes carrying the engineers landing before dawn at the Russian air base in Syria. Sunday's recapture of Palmyra by Syrian troops under the cover of Russian airstrikes was an important victory over Islamic State extremists who operated a 10-month reign of terror there. Lt. Gen. Sergei Rudskoi of the military's General Staff said that Russian military advisers had helped plan and direct the Syrian army's operation to recapture Palmyra.

The ancient ruins of Palmyra, one of Syria's oldest cities, have stood for 3,000 years, but, since last May, the Unesco World Heritage site has been facing some of the most brutal threats to its existence. Located in an oasis northeast of the Syrian capital of Damascus, Palmyra has become a significant symbolic and military position in the now 5-year-old Syrian conflict. After seizing the city of roughly 50,000 residents last May, the Islamic State group was forced out of Palmyra over the weekend by forces loyal to Syrian President Bashar Assad. On a strategic level, retaking Palmyra gives the Syrian regime a strong military base for future operations against the militants' other strongholds as well as renewed control over some of Syria's most important oil and gas fields. But regaining Palmyra is also a highly symbolic win for the Syrian regime -- now trying to salvage whatever is left of the ancient ruins -- in its quest to position itself as a key partner in the fight against the terrorist group, also known as ISIS. An aerial view of the historic city of Palmyra, in Homs Goveronorate, Syria, is seen in this still image taken from a drone video, March 28, 2016.