Russian bombers will be accompanied by fighter aircraft on all future combat missions in Syria, according to Russia's General Staff.

Following the loss of a Sukhoi Su-24 attack aircraft, Moscow has ordered a series of additional measures to strengthen its defenses in Syria. Notably, the "Mosvka" battle cruiser will begin sentry duty along the coast of Latakia, where Russia operates an airbase.

Russia has also announced the suspension of all military contacts with Turkey.

For more on the downing of a Russian jet by the Turkish Air Force, see Turkey kills a Russian jet: What we know about the downed Sukhoi Su-24 in Syria