Syrian government forces have, for weeks, been conducting a crushing military campaign to recapture parts of the last rebel-held areas in Idlib province as well as the countryside of neighboring Aleppo province.
The UN has put the number of civilians displaced since December 1 at more than 900,000 - a lot of them women and children.
"The mass displacement, coupled with the disruption in services due to the damage wrought on service delivery centers, places the lives of countless women and girls at risk, further disrupting the ability of the humanitarian community to deliver much-needed services", Samir Aldarabi, UNFPA communications adviser for Arab States, said. He said aid efforts are "overwhelmed".
"Young children are dying from cold".
Moscow has repeatedly vetoed Security Council resolutions. Hence there has been some limited cooperation between the Assad regime and the SDF in deterring the further expansion of the Turkish-occupied area.
Syrian opposition activists, meanwhile, reported airstrikes on several rebel-held areas Tuesday, including the outskirts of the town of Atareb and Daret Azzeh.
Almost 300 civilians have been killed in attacks this year in northwest Syria - 93% of them caused by strikes by the Syrian government and its ally Russian Federation, according to Ms Bachelet. He and his family had fled to Daret Azzeh from Maaret el-Numan only about a month ago.
He estimated that 900,000 people had been displaced since December 1.
"I hope that you will let the world know what sufferings, what pain, what frustration, and what inhuman conditions that we are living here now", she said during a briefing call with al Khateeb, organized by Refugees International, an advocacy organization.
Turkey has said two of its soldiers were killed and another five were wounded in Russian air strikes near the northwestern region of Idlib in Syria on February 20, signifying an escalation in the civil war in which Ankara and Moscow support opposing sides. A truce reached between the two countries collapsed in late 2019, leading to the current Syrian offensive, backed by Russian Federation.
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Turkish President Tayyip Erdogan has said his military will drive back Syrian forces if they do not withdraw from Idlib by the end of the month. That has led to rare clashes between Turkish and Syrian troops with fatalities on both sides.
Mr Erdogan told MPs in Ankara: "Turkey has completed preparations for the implementation of its plan on Idlib, just like we did with previous operations". "We did not reach the desired results in our talks (with Russia). We could enter (Idlib) suddenly one night".
A Turkish delegation will head to Moscow on Monday, after Russian officials visited Ankara last weekend but failed to reach a concrete deal.
The end of the talks came hours after the United Nations human rights chief urged Syrian government forces and their allies to allow safe corridors in conflict areas in northwestern Syria, where a military offensive has unleashed a massive wave of fleeing civilians in one of the worst humanitarian catastrophes in the long civil war.
The US repeatedly warned Turkey not go ahead with the purchase, saying it would expose North Atlantic Treaty Organisation military secrets to Russian Federation. "That's where our satisfaction ended".
For the past few years, Turkey has played its alliances with Russian Federation and the USA interchangeably to affect the turn of events in northern Syria.
Syrian warplanes flew in the sky in a show of force and celebration.
Hammoud called the opening of the airport a "great joy" for Syrians and a "dream" for the ministry.
According to the Observatory, government forces made new gains in western Aleppo province on Tuesday and were pushing towards the Sheikh Barakat mountain. With control of this main highway the Syrian Army appears to be on the verge of controlling the whole of Aleppo Province. The secretary-general calls for an immediate ceasefire and respect for worldwide humanitarian law, it said. He added that airport was secured during the Syrian war, despite attacks by armed groups. An Oxfam volunteer also was injured, the group said in a statement.