The UN agency’s decision comes amid a funding shortage as northwest Syria faces increasing food insecurity.
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Syrian couples who can’t have children are fostering, jofully embracing life as parents.
Russian and Syrian regime attacks have killed 66 civilians since the start of October, and displaced 120,000 people.
More than 65 civilians have been killed in Idlib and nearby cities by government forces and Russia so far this month.
An elderly man and a woman were killed, two others wounded in a rocket attack on the outskirts of the city of Sarmin.
Al-Zawiya’s caves shelter Syrian families whose homes have been under attack as regime forces hound Idlib.
It is the first such visit in six years since members of US Congress went to Syria led by late Senator John McCain.
Routes into the city remain closed on Monday as protests break out over deteriorating living conditions.
In a region decimated by an earthquake and populated mostly by IDPs, the intense heat is making life even harder.
Rima Haj Hussein was trapped under the rubble and forced to choose between her life and her leg.