UNITED NATIONS — Israel suffered back-to-back diplomatic setbacks in Europe on Wednesday, while the Palestinians at the United Nations set a deadline for an Israeli withdrawal from lands captured nearly 50 years ago by the end of 2017.In Geneva, the international community delivered a stinging rebuke to Israel's settlement construction in the West Bank and east Jerusalem, saying the practice violates Israel's responsibilities as an occupying power.The declaration adopted by the conference of the Fourth Geneva Convention, which governs the rules of war and military occupation, emphasized a prohibition on colonizing occupied land and insisted that international humanitarian law be obeyed in areas affected by the conflict between Israel and Palestinians.