This is the real reason why Russia had to inform the other side that they will definitely experience the Bear’s Wrath if they’ll do it again.
They know exactly who shot down Russian Flight 7K9268 and killed 224 civilians on board.
A failure to heed the Russian warning would led to something “unacceptable”:

“The presentation slide titled “Ocean Multipurpose System: Status-6” showed some drawings of a new nuclear submarine weapons system. It is apparently designed to bypass NATO radars and any existing missile defense systems, while also causing heavy damage to “important economic facilities” along the enemy’s coastal regions.
The footnote to the slide stated that Status-6 is intended to cause “assured unacceptable damage” to an adversary force. Its detonation “in the area of the enemy coast” would result in “extensive zones of radioactive contamination” that would ensure that the region would not be used for “military, economic, business or other activity” for a “long time.”
According to the blurred information provided in the slide, the system represents a massive torpedo, designated as “self-propelled underwater vehicle,” with a range of up to 10 thousand kilometers and capable of operating at a depth of up to 1,000 meters.”
read more

Sanity has long left the US government…

Rebels Have CIA Weapons Capable of Downing Planes Flying Above 10Km Range

18:04 13.11.2015 (updated 18:46 13.11.2015)

The fact that Syrian rebels fighting against Bashar al-Assad, a Russian ally, had CIA-sponsored weapons capable of downing a commercial airliner flying above 10,000 meters, makes a very uncomfortable situation for the US government amid the crash of the Airbus A321 operated by the Russian airliner Kogalymavia on October 31, the author said.
“I really wonder how John Kerry can still look Sergei Lavrov straight in the eye during the [upcoming] talks on Syrian reconciliation in Vienna,” Hildegard said, according to Boulevard Voltaire, adding that the United States treats Russia as if it was Honduras or Grenada.
The main question is could these rebels shoot down the Russian Airbus A321 in the Sinai Peninsula using a weapon that Turkey or Saudi Arabia provided as per CIA orders?
Shoulder-launched man-portable air-defense systems (MANPADs) were delivered to Syrian opposition forces to fight against the Syrian Army, loyal to President al-Assad. Although the US government says that these lethal weapons were only given to certain “moderate” Syrian rebels, there isn’t a guarantee that one of these weapons might have ended up in the hands of more radical jihadists.
There are documented cases of US-weapons provided to “moderate” rebels that then ended up being used by ISIL and the al-Nusra Front. The CIA also delivered anti-tank TOW missiles and new Toyota jeeps to transport jihadists.
Even if the Airbus A321 wasn’t downed by a CIA-sponsored MANPAD, Russian fighter jets currently bombing ISIL targets in Syria might fall in danger of being shot down by these weapons. For that matter any airplane from any country, whether a military or civil, that happens to fly within the firing range of a terrorist group with a MANPAD becomes a potential target.
On October 31, the Airbus А321, operated by the Russian airline Kogalymavia en route from the Egyptian resort of Sharm El-Sheikh to St. Petersburg, crashed in the Sinai Peninsula, killing all 224 people on board. The tragedy is the largest civil aviation disaster in Russian history.
http://sputniknews.com/middleeast/20151113/1030033635/rebels-anti-aircraft-weapons-commercial-planes.html