The same dynamic has played out in various forms in Lebanon, where Iran supports the Shiite militant Hezbollah and Saudi Arabia favors a U.S.-backed faction, and in Iraq, where Saudi Arabia and Iran have thrown support to conflicting sides in the Sunni-Shiite struggle.

A top Saudi government adviser confirmed "a large scale" military operation underway on the Saudi-Yemeni border with further reinforcements sent to the rugged, mountainous area.

"It is a sustained operation which aims to finish this problem on our border," he said, speaking on condition of anonymity because of the sensitivity of the issue. He said Saudi troops were coordinating with Yemen's army, but Yemen's defense ministry denied the Saudis were inside the country.

The northern rebels, known as Hawthis, have been battling Yemeni government forces the past few months in the latest flare-up of a sporadic five-year conflict. They claim their needs are ignored by a Yemeni government that is increasingly allied wit

Let's see, the last time the US equipped a Middle-Eastern country and tasked them strike at Iran, the US ended up eventually invading and occupying that country, and publicly executing the leader they gave the weapons and money to in the first place.

The Saudi King should watch his butt.