Iranian officials have warned of an "immediate and unprecedented" response to any US attackAmid the din of global speculation over US military build-up in the Middle East, Israel's leaders have remained unusually silent.Aside from some remarks in support of Iran's anti-government protests this month, Israel's prime minister has had little to say publicly about his superpower ally taking on his biggest enemy. His government has remained equally silent."It shows you the importance Netanyahu puts on this moment," said Danny Citrinowicz, who served for 25 years in Israel's Defence Intelligence, and is now senior Iran researcher at Israel's Institute for National...