Fourteen members of the United Nations Security Council approved a resolution on Monday calling for a ceasefire in Gaza, with the United States representing the sole abstaining vote.

The body approved the document, which centers on “demanding an immediate ceasefire for the month of Ramadan,” as well as the “immediate and unconditional release” of Israeli hostages and “the urgent need to expand the flow” of aid into Gaza. Renewed conflict in the region indeed comes after Islamic militant group Hamas abducted hundreds of Israeli civilians last year.

“The Security Council just approved a long-awaited resolution on Gaza, demanding an immediate ceasefire, and the immediate and unconditional release of all hostages,” United Nations Secretary-General Antonio Guterres commented in a statement, adding that “this resolution must be implemented” and warning that “failure would be unforgivable.”

The lone abstention from the United States comes as the Biden administration faces pressure from progressives in the Democratic Party to call for a ceasefire. United States Ambassador to the United Nations Linda Thomas-Greenfield supported the “critical objectives” outlined in the resolution but said a ceasefire could have come “months ago” had Hamas released hostages.

Members of the Security Council approved the resolution days after Russia and China vetoed a similar proposal from the United States. Chinese Ambassador to the United Nations Zhang Jun told his colleagues that “the current draft is unequivocal and correct in its direction, demanding an immediate ceasefire, while the previous one was evasive and ambiguous.”

American lawmakers have called for more aid to support Israel amid the conflict with Hamas. Israel has received $158 billion in American aid since the nation was founded in 1948, according to a report issued last year by the Congressional Research Service, rendering Israel the largest cumulative recipient of American foreign assistance since World War II.