A look at the U.S.-Saudi alliance that has endured for more than 70 years. embed code and instructions: https://reut.rs/2RiHS3j

Russian President Vladimir Putin attends a meeting with Saudi Crown Prince Mohammed bin Salman at the Kremlin in Moscow, Russia June 14, 2018. Yuri Kadobnov/Pool via REUTERS

Saudi Crown Prince Mohammed bin Salman speaks with Russian President Vladimir Putin during their meeting at the Kremlin in Moscow, Russia June 14, 2018. Yuri Kadobnov/Pool via REUTERS

Russian President Vladimir Putin shakes hands with Saudi Crown Prince Mohammed bin Salman during their meeting at the Kremlin in Moscow, Russia June 14, 2018. Yuri Kadobnov/Pool via REUTERS

U.S. Secretary of State John Kerry gestures during a news conference in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser

U.S. Secretary of State John Kerry attends a news conference in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser

U.S. Secretary of State John Kerry gestures during a news conference in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser

U.S. Secretary of State John Kerry (L) speaks with Oman's Foreign Minister Yusuf bin Alawi bin Abdullah before a meeting in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser

Saudi Arabia's Foreign Minister Adel al-Jubeir attends a meeting with U.S. Secretary of State John Kerry and several Gulf Cooperation Council (GCC) foreign ministers in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser

(L-R) Saudi Arabia's Foreign Minister Adel al-Jubeir, U.S. Secretary of State John Kerry, Oman's Foreign Minister Yusuf bin Alawi bin Abdullah talk before a meeting in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser

U.S. Secretary of State John Kerry attends a meeting with several Gulf Cooperation Council (GCC) foreign ministers in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser

FILE PHOTO - Houthi followers step on a banner with crosses over the faces of U.S. President Barack Obama, Saudi Deputy Crown Prince Mohammad bin Salman, Yemeni President Abd-Rabbu Mansour Hadi and Saudi King Salman bin Abdul Aziz (L-R) during a demonstration against the Saudi-led air strikes, in Sanaa May 8, 2015. REUTERS/Khaled Abdullah/File Photo

U.S. Secretary of Defense Ash Carter (L) welcomes Saudi Arabia's Deputy Crown Prince and Minister of Defense Mohammed bin Salman to the Pentagon in Washington, U.S., June 16, 2016. REUTERS/Yuri Gripas

U.S. Secretary of Defense Ash Carter (L) welcomes Saudi Arabia's Deputy Crown Prince and Minister of Defense Mohammed bin Salman to the Pentagon in Washington, U.S., June 16, 2016. REUTERS/Yuri Gripas

U.S. Secretary of Defense Ash Carter (L) hosts an enhanced honor cordon to welcome Saudi Arabia's Deputy Crown Prince and Minister of Defense Mohammed bin Salman to the Pentagon in Washington, U.S., June 16, 2016. REUTERS/Yuri Gripas

U.S. Secretary of Defense Ash Carter (L) hosts an enhanced honor cordon to welcome Saudi Arabia's Deputy Crown Prince and Minister of Defense Mohammed bin Salman to the Pentagon in Washington, U.S., June 16, 2016. REUTERS/Yuri Gripas

U.S. Secretary of Defense Ash Carter (C-L) hosts an enhanced honor cordon to welcome Saudi Arabia's Deputy Crown Prince and Minister of Defense Mohammed bin Salman to the Pentagon in Washington, U.S., June 16, 2016. REUTERS/Yuri Gripas

SAUDIARABIA-EARNINGS/ - Year-on-year net profit percentage of change for top 50 listed Saudi companies by market capitalisation and banks and petrochemical companies among them.

Jordan's King Abdullah (R) speaks with Saudi Arabia's Deputy Crown Prince Mohammed bin Salman, upon his arrival at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Jordan's King Abdullah (2nd L) speaks with Saudi Arabia's Deputy Crown Prince Mohammed bin Salman (L), upon his arrival at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Jordan's King Abdullah (front 3rd R) welcomes Saudi Arabia's Deputy Crown Prince Mohammed bin Salman (front, 4th R), upon his arrival at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Jordan's King Abdullah (back to camera) welcomes Saudi Arabia's Deputy Crown Prince Mohammed bin Salman upon his arrival at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Saudi Arabia's Deputy Crown Prince Mohammed bin Salman (C) walks to meet Jordan's King Abdullah upon his arrival at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Jordan's King Abdullah (R) speaks with Saudi Arabia's Deputy Crown Prince Mohammed bin Salman, upon his arrival at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Jordan's Prince Faisal bin Al-Hussein (R) and Saudi Arabia's Deputy Crown Prince Mohammed bin Salman (C) walk upon their arrival to meet Jordan's King Abdullah at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Jordan's Prince Faisal bin Al-Hussein (2nd R) and Saudi Arabia's Deputy Crown Prince Mohammed bin Salman (4th R), review Bedouin honour guards upon their arrival to meet Jordan's King Abdullah at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Saudi Arabia's Deputy Crown Prince Mohammed bin Salman (front 2nd R) reviews Bedouin honour guards upon his arrival to meet Jordan's King Abdullah at the Royal Palace in Amman, Jordan, August 4, 2015. REUTERS/Muhammad Hamed

Qatar's Foreign Minister Khalid bin Mohamed Al-Attiyah presides over the Gulf Cooperation Council (GCC) meeting in Riyadh February 14, 2015. REUTERS/Faisal AlNasser (SAUDI ARABIA - Tags: BUSINESS POLITICS)

Saudi Arabia's Deputy Foreign Minister Prince Abdulaziz bin Abdullah bin Abdulaziz (R) and Bahrain's Foreign Minister Sheikh Khaled bin Ahmed al-Khalifa arrive for the Gulf Cooperation Council (GCC) meeting in Riyadh February 14, 2015. REUTERS/Faisal AlNasser(SAUDI ARABIA - Tags: BUSINESS POLITICS)

Oman's Foreign Minister Youssef bin Alawi bin Abdullah he arrives for the Gulf Cooperation Council (GCC) in Riyadh February 14, 2015. REUTERS/Faisal AlNasser (SAUDI ARABIA - Tags: BUSINESS POLITICS)

Saudi Arabia's Deputy Foreign Minister Prince Abdulaziz bin Abdullah bin Abdulaziz attends the Gulf Cooperation Council (GCC) meeting in Riyadh February 14, 2015. REUTERS/Faisal AlNasser (SAUDI ARABIA - Tags: BUSINESS POLITICS)

A military personnel stands in front of the hall meeting attended by Gulf Cooperation Council (GCC) foreign ministers in Riyadh January 21, 2015. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: POLITICS)

Gulf Cooperation Council (GCC) foreign ministers attend a meeting in Riyadh January 21, 2015. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: POLITICS)

Oman's Minister of Foreign Affairs Yusuf bin Alawi bin Abdullah attends the Gulf Cooperation Council (GCC) meeting in Riyadh January 21, 2015. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: POLITICS)

United Arab Emirates Minister of Foreign Affairs Sheikh Abdullah bin Zayed Al Nahyan arrives to attend the Gulf Cooperation Council (GCC) meeting in Riyadh January 21, 2015. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: POLITICS)

United Arab Emirates Minister of Foreign Affairs Sheikh Abdullah bin Zayed Al Nahyan attends the Gulf Cooperation Council (GCC) meeting in Riyadh January 21, 2015. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: POLITICS)

Qatar's Foreign Minister Khalid bin Mohammad Al-Attiyah presides over the Gulf Cooperation Council (GCC) meeting in Riyadh January 21, 2015. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: POLITICS)

A youth plays the oboe (flute) near cats in Jeddah December 12, 2014. The oboe, or mizmar in Arabic, is a widely used musical instrument in Saudi Arabia. REUTERS/Mohamed Al Hwaity (SAUDI ARABIA - Tags: SOCIETY ANIMALS)

Muslim pilgrims pray upon their arrival to the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca October 2, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray upon their arrival to the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca October 2, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims are pictured through a roof opening as they sleep during the annual haj pilgrimage in Mena, near the holy city of Mecca, October 2, 2014. REUTERS/Mohamed Alhwaity (SAUDI ARABIA - Tags: RELIGION SOCIETY TPX IMAGES OF THE DAY)

Muslim pilgrims walk during the annual haj pilgrimage in Mena, near the holy city of Mecca October 2, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims walk during the annual haj pilgrimage in Mena, near the holy city of Mecca October 2, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

A Muslim pilgrim prays around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims take pictures for the pilgrims as they pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca October 1, 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray at the Grand Mosque, during the annual haj pilgrimage in Mecca September 30 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca September 30 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca September 30 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca September 30 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)

Muslim pilgrims pray around the holy Kaaba at the Grand Mosque, during the annual haj pilgrimage in Mecca September 30 2014. REUTERS/Muhammad Hamed (SAUDI ARABIA - Tags: RELIGION)