During the Oslo Accords, and for years afterwards, it was absolutely understood by both sides that Israel would maintain tracks of the West Bank with major Israeli population centers, and in return giving up other areas that are not heavily populated in return. The remaining sticky issue was Jerusalem. Since the inauguration of President Obama, the Palestinians have totally backtracked on what was and are demanding their borders will be the 1967 lines period. No consideration for Israeli security needs. No consideration for past agreements. The Palestinians are just blasting their way in and out of negotiations and pointing their finger at Israel because that is the way they (falsely) believe they will get better bargaining power.
Opposition leader Isaac Herzog to speak at anti-violence rally in Tel Aviv on Sat. night (Haaretz)
from the article: Israeli, Palestinian negotiators clash at Jordan meeting