NGOs have warned that Syria will witness a ‘humanitarian catastrophe’ if Russia vetoes the continued use of border crossings into the rebel-held northwest of the country to deliver life-saving aid. The International Rescue Committee (IRC), CARE, and World Vision were among 29 NGOs to issue a joint statement on Thursday warning of an unprecedented crisis in northern Syria if cross-border aid is ended. Syrian regime ally Russia has threatened to veto the use of border crossings between Turkey and Idlib for vital aid when the UN Security Council meets later in July. “The consequences of this woul…