US SUPPYING $380 billions to Saudi Arabia -What's the implications?

$380 billions weaponary for oil trade only? or is there more than meet the eyes?

Weapons and US protection for Saudi from Iranian threat? or is it a gaurantee military backing to openly invades the Yemeni territory to take over their oil rich yet untapped oil resources and to stand by to intervene if Iran enter into the conflicts to protect predominantly Shite Muslim oil richef Yemen.

Secondly, Russia has long term oil supply to China for economic as well as for emergency war time needs, similarly, US has Saudi Arabia as their oil supplier.

So, the way I see it , the conquest of Yemen will quickly followed up by WWIII.
At the same time divert the attention away from a bankruppted fiat based economical system.

Just my common sense observations!

What say you?