Saudi Arabia, the world's top crude exporter, is leading the Organization of Petroleum Exporting Countries and other producers including Russian Federation in paring output under a deal that helped propel oil into a bull market in September.
"We will not let anyone spread the ideology of hatred, to finance that kind of ideology or terrorism", he said. The Russian Federal Service for Military-Technical Cooperation said Monday that Russia and Saudi Arabia reached agreement on the supplies of S-400 systems to Riyadh.
The Pentagon's Defense Security Cooperation Agency said in an October 6 statement that it had notified the U.S. Congress about the possible sale, saying the deal would "support the foreign policy and national security objectives of the United States".
The transaction covers the delivery of 44 Terminal High Altitude Area Defense launchers, 360 interceptor missiles, 16 fire control and communications mobile tactical station groups and seven AN/TPY-2 radars.
The S-400 is Russia's most advanced long-range anti-aircraft missile system and can carry three types of missiles capable of destroying targets, including ballistic and cruise missiles.
"They pose a threat for our countries and for other states, from where they came from".
"Lots of militants from both Russian Federation and Saudi Arabia are fighting for the Islamic State [terrorist group, outlawed in Russia]", the Saudi top diplomat said.
Despite increasing coverage over Saudi Arabia's involvement in the September 11, 2001 attacks, the two countries share an interest over Iran's ballistic missile program in the Middle East.
The US has already deployed THAAD to South Korea in defence of North Korea's short-range missiles, which has angered China for interfering.