Saudi Arabia and Afghanistan have a complex relationship. Their ties date back to the 19th century when Afghanistan became the first Muslim country to recognize the second Saudi state of 1824 to 1891. In 1930, Ibn Saud recognized King Nadir Shah’s rule in Afghanistan, in 1932, the two countries signed their first friendship agreement, and in 1950, King Zahir Shah’s visit to Saudi Arabia was commemorated on a Saudi stamp.
Ties over the following decades remained close. This was not so much because of Saudi geopolitical interests in Afghanistan, but rather how the country affected Saudi Arabia’s relations with Iran and Pakistan, a major rival and an important ally of the kingdom respectively.
Saudi Arabia and the Grand Debacle in Afghanistan (fairobserver.com)