Tens of thousands of Syrians suffering tropical disease outbreak
Hundreds of thousands have been displaced from southern Hama and northern Idlib since late April, when the Syrian regime and its Russian ally launched a fierce aerial and ground campaign to recapture the rebel-held bastion.
Around half of the 3 million strong population of Idlib have already been displaced from elsewhere in Syria.
The lowest UN estimate says around 576,000 - half of them children - have been displaced by the regime offensive to retake Idlib, while the Syrian Response Coordination Group puts that figure at around one million.
Humanitarian organisations say those fleeing regime and Russian aerial bombardment are being forced into refugee camps that are already hosting mutliple times their capacity.
That means displaced Syrians are facing near catastrophic conditions as humanitarian organisations are unable to access the requisite funds to cope with the sheer numbers of refugees.
Read more: Syria Weekly: Regime advance in Idlib threatens genocide of Syrians
|Many of the displaced are living outdoors with no access to clean water [Anadolu]|
Dirani said the response from the UN, whose Syrian Cross-border Humanitarian Fund has failed to acquire more than 28 percent of the requisite funds so far this year, has been "very weak".
Airstrikes in Idlib have killed more than 900 civilians since late April, including 237 children, according to the UK-based Syrian Observatory for Human Rights, and the fighting has left more than a thousand fighters on each side dead.
At least 13 people were killed on Wednesday when Syrian regime warplanes struck a city in southern Idlib province, according to local activists.
Among those killed in the airstrikes on the city centre of Maarat al-Numan were six children, according to the Syrian Civil Defence. A further 34 people were injured.