Russia has carried out five consecutive air strikes targeting a refugee camp in a neighbourhood in Idlib, according to UK-based human rights group the Syrian Observatory for Human Rights (SOHR). The strikes killed at least one civilian and have injured others, the monitor says.

At least 25 people were killed in northwestern Syria in air strikes carried out by the Syrian government and Russia, the Syrian opposition-run rescue service known as the White Helmets said early on Monday.

BEIRUT—Syria’s President Bashar al-Assad is facing the most serious challenge to his grip on power in nearly a decade after rebels captured most of the city of Aleppo in a swift offensive that crumpled his Russian- and Iranian-backed forces and has the potential to alter the balance of power in the Middle East.