The United States has vetoed a UN Security Council resolution that asked the secretary-general to propose ways to ensure "international protection" for Palestinian civilians.
The council hasn't voted yet on a competing US proposal to condemn Hamas over the recent escalation of violence in Gaza.
Friday's votes come after weeks of urgent discussions about Gaza.
U.S. Ambassador Nikki Haley had vowed to veto the Arab-backed resolution, drafted by Kuwait. She called it "grossly one-sided" for demanding a halt to what "excessive" Israeli force while not mentioning Hamas, the militant group that controls Gaza.
The US resolution deletes the reference to Israeli force and protecting Palestinians. Instead, it demands that Hamas and other Palestinian militant groups stop "all violent activity and provocative actions" in Gaza.