Conversation so far:
How did Ban Ki-moon affect the Middle East?
He criticized both sides, Israel for bombarding Gaza and Hamas for firing rockets into Israel.
What did Ban Ki-moon suggest at the meeting of the UN Security Council in 2009 about the Gaza Strip?
During a meeting of the UN Security Council on Wednesday, 7 January 2009, Ban called for an immediate end to fighting in the Gaza Strip.
What else did Ban Ki-moon say about the Gaza Strip in 2009 ?
Did Ban Ki-moon support any position for the attacks in the middle east?
He criticized both sides, Israel for bombarding Gaza and Hamas for firing rockets into Israel.

Question: Did he change the bias of the UN towards Israel?
Self-contained rewrite: Did Ban Ki-moon change the bias of the UN towards Israel?