Among other things, the Saudi air defense will be strengthened with two sets of the Patriots system and one set of the THAAD robotic defense system.

The Huthi rebels in Yemen took on the robotic and drone attacks on the oil plants on September 14. However, the United States and several other countries have pointed out Iran as guilty of the attack, which knocked out 50 percent of Saudi Arabia's oil production.

The United States has increased the number of soldiers in the Middle East by about 14,000 since May.