Final answer:
Menachem Begin was the Israeli UN ambassador who became Prime Minister, and his tenure was marked by significant agreements such as the Camp David Accords. The involvement of Begin and other figures in the peace processes and regional diplomacy had long-lasting impacts on Middle Eastern politics.
Step-by-step explanation:
The Israeli ambassador to the UN who became the Prime Minister is Menachem Begin.
During the time of the Ford administration, Secretary of State Henry Kissinger engaged in what was known as shuttle diplomacy, with efforts leading to the signing of the Camp David Accords, where Israel agreed to return part of the Sinai Peninsula back to Egypt.
Subsequently, Menachem Begin, as a key Israeli leader, eventually became Prime Minister and was influential in reaching agreements with Egypt.
Another significant Prime Minister of Israel who held the position of UN ambassador before becoming Prime Minister is Benjamin Netanyahu.
His term included navigating various challenges within the region and dealing with international relations through a complex political landscape.