Here are some developments that proves a war between Israel and Iran is imminent.
1. The nuclear talks between US and Iran has failed. Trump says he's out of it.
2. US stays silence, vetoes against Israel's genocide in Palestine.
3. US secretly supplies missiles and arms to Israel.
4. Iran claims it would target US base in Middle East if Iran is attacked (by Israel).
5. US evacuates non-essential people and forces from Middle East bases.

It's clear that US is trying to use Israel as a tool to bomb the nuclear infrastructure of Iran to dust. Even though US would claim they are not involved, Iran clearly knows its all planned and executed by US. If things get bad, US could actively get involved.

On doing the risky operation, Israel gains support of US for its genocide in Palestine as well weakens its regional enemy Iran.

US and Israel has mute support from Saudi as well. Iran with nuclear weapons would be a problem to Saudi and the middle east.

On global scale, the war may again increase the price of oil and gas as most of it originates or ships through middle east.