Yonatan is correct that the settlements are not the real obstacle to peace. The real obstacle is the continued refusal of the Palestinians, whatever faction, to recognize Israel as the Homeland of the Jewish People. If territory won in war was illegal then the U.S., Russia, England and others would have to give back a lot of territory. The UN chief should know better!
Woman arrested trying to jump White House fence (Reuters)
from the article: UN chief Ban in Ramallah: Settlements undermining peace