Last week a Russian jet was shot down by a portable shoulder missile. Naturally Russia retaliated with violence and killed all the unit responsible.
The issue is that the weapons have been given to them by the US 2018 National Defense Authorization Act signed by President trump)to the Free Syrian Army, specifically HTS (Al Qaeda re branded).
Now, they really do not understand that a portable shoulder missile in the hands of the “now friendly” Al Qaeda can be easily sent too Europe close to a civilian airport?
When it happens, don’t blame the Russians please.