A period of high-level diplomacy on the Middle East opens in New York today promising further insights into an emerging strategy from Barack Obama's administration that is already raising concerns among Israel's supporters.
A US official this week broke a long-standing taboo by referring in a speech at the United Nations to Israel's nuclear weapons, and Joe Biden, vice-president, delivered a message to the biggest US pro-Israel lobby group that he warned they were "not going to like".
