FILE - In this April 19, 2020 file photo, shows a large refugee camp on the Syrian side of the border with Turkey, near the town of Atma, in Idlib province, Syria. Millions of Syrians risk losing access to lifesaving aid, including food and COVID-19 vaccines if Russia gets its way at the Security Council by blocking the use of the last remaining cross-border aid corridor into northwestern Syria, an international rights group said Thursday, June 10, 2021. (AP Photo/Ghaith Alsayed, File)

FILE - In this June 3, 2021 handout file photo provided by the US Embassy in Turkey, Linda Thomas-Greenfield, U.S. Ambassador to the United Nations, examines aid materials at the Bab al-Hawa border crossing between Turkey and Syria. Millions of Syrians risk losing access to lifesaving aid, including food and COVID-19 vaccines if Russia gets its way at the Security Council by blocking the use of the last remaining cross-border aid corridor into northwestern Syria, an international rights group said Thursday, June 10. (US Embassy in Turkey via AP)