Amid 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 Security Studies.

"For Netanyahu, being in this position where the US has so many forces in the Gulf, being so close to Trump attacking Iran, this is - for him - a golden moment in time that he cannot forgo."

Asaf Cohen, a former deputy director of Israel's signals intelligence unit, says there's strategy in Israel's silence too.