Till these jihadists take artillery school there were no serious action from RuAF.
Cool2HatE
1

Russian jets operating over Syria are effectively invulnerable to anything but mechanical failure. Helicopters are vulnerable to AAA and even antitank missiles -

The US famously lost 2 UH-60 to RPGs in Mogadishu, but Russian attack helos use different attacks that make them less vulnerable to such light weapons.