Saudi Arabia has been a false friend over the years and recently determined to be behind the 9/11 terrorist attacks on the U.S. It was determined that Saudi Arabia provided the financial backing to fund the 9/11 plot. The U.S. should sanction Saudi Arabia and be cautious of any relationship with that country.
The United States depends so much on Saudi Arabian oil though the conflicted country could very well be supporting and funding terrorism, but Saudi Arabia should not be sanctioned. Studies show that money is difficult to track in Saudi Arabia, and proving national or public contributions to terrorism is nearly impossible. No judicial entity can ethically hold an entire country accountable for the actions of a few.
Saudi Arabia represents an important economic ally of Western states, and one of the few prosperous Middle Eastern countries that is not facing widespread political instability and poverty. Although factions within Saudi Arabia have been suspected of supporting known terrorist organizations, there is little evidence that the ruling government has been involved. Sanctions would send the wrong message at a time when the Iran nuclear agreement has already caused strained relations between the United States and Saudi Arabia.
The best way to sanction Saudi Arabia is to stop having so much dependence on their foreign oil. We need to create solar powered vehicles and rely on our own oil. This will help to bankrupt them. They have made their wealth off the backs of Americans and had a lot to do with 09/11 but there is nothing we can do about that now without catastrophic events. The irony of life is everything comes around full circle. There are now terrorist on their backdoors for them to deal with. They thought it was a West problem but not so fast...look who's knocking on their door, their own creation.