Residents of embattled northwest Syria warned Saturday of a deepening humanitarian crisis following a Russian veto at the UN Security Council that threatens to end cross-border aid deliveries critical to their survival. Friday’s veto of a resolution that would have extended authorisation for UN aid deliveries through the Bab al-Hawa crossing on the Syrian-Turkish border by one year came on the eve of the Muslim Eid al-Adha holiday. It cast a pall over celebrations and has left residents of Syria’s last major opposition bastion increasingly worried, at time when humanitarian needs have reached …