In a striking rupture with past practice, the United States allowed the U.N. Security Council on Friday to condemn Israeli settlements in the West Bank and east Jerusalem as a "flagrant violation" of international law. In doing so, the outgoing Obama administration brushed aside Donald Trump's demands that the U.S. exercise its veto and provided a climax to years of icy relations with Israel's leadership.

The decision to abstain from the council's 14-0 vote is one of the biggest American rebukes of its longstanding ally in recent memory. And it could have significant ramifications for the Jewish state, potentially hindering Israel's negotiating position in future peace talks. Given the world's widespread opposition to settlements, the action will be almost impossible for anyone, including Trump, to reverse.

Nevertheless, Trump vowed via Twitter: "As to the U.N., things will be different after Jan. 20th."

The resolution said Israel's settlements in lands the Palestinians want to include in their future state have "no legal validity." It demanded a halt to such activities for the sake of "salvaging the two-state solution." Loud applause erupted in the council chamber after U.S. Ambassador Samantha Power permitted the resolution to pass.

Friday's condemnation, a day after Egypt suddenly postponed a scheduled showdown, capped days of frantic diplomacy in capitals around the world.