And well outside Turkish airspace by the time the missile hit.
Which the US seems to be agreeing with now - but through "an official" rather than any named source. The Russians deny that their pilot crossed into the Turkish land finger at all, but even if he did, the radar track that Turkey provided demonstrates that it clearly wasn't an attack on Turkey and the transit time didn't even allow for enough time for a Turkish escort. The surviving Russian pilot said that he got
no warning from Turkish forces before the shoot-down.
While Turkey probably can't officially use the idea of its unilaterally declared buffer-zone to justify the shoot-down as being Turkish airspace, they may internally justify it.
This article talks about the buffer zone that Turkey claimed after one of their jets got shot down over Syria. Looking at that map then the area where the Russian jet was shot down (west of Idlib) is well within Turkey's claimed buffer zone.
Russia is (at least publicly) holding the line that this was
a deliberate provocation - and maybe it is, but to what end? Perhaps to complicate relations with NATO and to prevent any NATO / Russia cooperation, and then would that mean it is a unilateral act or one carried out at the behest of some group represented in the western elite? Officially NATO is
telling Turkey to get a grip.
On the other hand,
a Turkish blogger last month wrote that Erdogan was itching to shoot down a Russian plane to ramp up tensions with Russia to improve his election chances. When politicians are involved it's not necessarily a stretch to say that they can only think as far ahead as the next election and screw the consequences. On even another hand, this article speculates that it could be other groups perhaps in Turkish military or intelligence that would find this destabilization useful
to bring Erdogan down.
Perhaps it's just more
likely that the Turkish elite are basically OK with ISIS as a tool to topple Syria and is probably helping them quite a lot. This shoot-down looks like it was pretty close to Kessab, a town which Turkey played a part in having overrun with rebels. It's also pretty interesting to
read about the media management that the rebels had been instructed in by advisers.
In the end, and this is just my own feeling, the shoot-down seems to be a bit of a panic move and the justifications seem post-hoc to me. Since this is an area where Turkey has facilitated operations before I think it's quite possible that they may have been caught by surprise with some fairly high value assets in the area and they just made a snap decision to protect them and try to explain it away later.