The 2+2 was attended by Secretary of State Antony Blinken and Secretary of Defence Lloyd Austin and their Indian counterparts S Jaishankar and Rajnath Singh respectively.
A summit between the two PMs is scheduled to take place between December 15 and 17 in Guwahati, which has been witnessing massive protests for the last two days.
In a tweet, Modi said India is 'delighted to welcome' the Crown Prince of Saudi Arabia.