The U.N. Security Council on Friday passed a resolution demanding that Israel cease Jewish settlement activity on Palestinian territory in a unanimous vote that passed when the United States abstained rather than using its veto as it has reliably done in the past. The resolution declares settlements constructed on land Israel has occupied since the 1967 war, including in East Jerusalem, to have “no legal validity.” It said settlements threaten the viability of the two-state solution, and it urged Israelis and Palestinians to return to negotiations that will lead to two independent nations.