For those who have read the Viz profanisaurus, there's some amusement to be had in the fact the Russian forces replaced the S-300 'Grumble' with the S-400 'Growler'.
It's obvious that the 'foreign intervention' these systems are meant to deter is the type of intervention that happened in Libya, where NATO/ Arab League air power was used as a force multiplier for the anti-regime faction.
Not that I think the UK at least could intervene in that way anyway as it happens, we managed to pretty much deplete our arsenal of air to surface smart weaponry and I doubt we're back up to stock yet. Plus Libya was at roughly the edge of operation range for the Typhoon (since we decided to get rid of our aircraft carriers and sell all our STOL jets to the Americans

) and Syria is quite a lot further from Europe than Libya is.
Jon