The Palestinians should complain again to the UN and ask that the Security Council pass a Resolution condemning Israel for the new settlement activity. Such happened a while ago and the US vetoed it. But a repeat performance by Israel, and these times contrary to promises Netanyahu made to the US, may allow Obama to refrain from vetoing the condemnation resolution, since he knows he will veto the resolution on Palestinian statehood in September. A resolution of condemnation this time will help the Palestinians gain more states voting in the GA for their state. At least they will derive some political benefit from the move.
from the article: Israel approves 227 new homes in West Bank settlement of Ariel