Four Saudi Air Force 4-16 fighter bombers have arrived at Incirlik air base in southern Turkey ready to go into action against ISIS, the Defense Ministry in Riyadh announced Monday. Should the US-led coalition against the Islamic State decide to embark on ground action, Saudi Arabia will be ready to supply such forces, the statement said. DEBKAfile: Russia has warned Saudi Arabia, like Turkey, against sending their air or gound forces to intervene in the Syrian conflict.