Israel could launch a unilateral strike on Iran's nuclear facilities without much prior notice to its closest ally for over 60 year, US, according to information reaching here in London from Tel Aviv.

While the Israeli leadership has signaled support for US president Barack Obama in his re-election bid by urging Jewish voters in America to vote for him, Israel's defence minister Ehud Barak is said to have told general Martin Dempsey, chairman of the US joint chiefs of staff, that Israel will give the US no more than 12 hours notice before it ventures to demolish Iran's nuclear installations.

Barak's message to Dempsey followed what Israeli Prime Minister Benjamin Netanyahu had told Obama: that an early warning of Israel's intentions would not be available to the US. The Israeli army's elite 35th Paratroopers Brigade is training for a long range operation for some time, so as to be prepared for military action against Iran's nuclear plants.

Expressing its displeasure at the non-cooperation, US has cancelled a joint antimissile exercise with Israel, which had been planned for April. On Monday, foreign ministers of the EU were expected to ban Iranian oil imports as part of efforts to tighten sanctions on Tehran.