"This war, or rather Saleh's move, came too late, I mean, after Houthis have become so strong, having seized most of the country's weapons and resources. In this current status, I think they even don't need foreign support," he added.

While all signs show that the Saudi-led coalition may now think of supporting Saleh against the Iran-backed Houthis, observers argued that Iran will also not fail the Houthis.

Faris Al-Beel, a political analyst and college professor, said Iran will do whatever it can to help Houthis militarily, politically and economically.

"Iran will not accept (the fate) to let Sanaa fall. If it fails to keep Sanaa under Houthi control, it will destabilize the city through systematic violence," Al-Beel said.

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