Whether Putin disputes the airspace issue is secondary. Shooting down an aircraft is an act of war and Putin is obligated to respond. The dispute over whether or not the airspace was violated is the realm of diplomats and Putin ain’t one.
IF (big IF) the Russian aviator did violate the airspace, the Turks are obligated to attempt to force the offending aircraft out of their airspace, not shoot it down. If the Russians turned hot towards the Turks, then all bets are off. I doubt that is what happened as the Russians are focused on ISIS. This act shows where Turkey’s loyalties lie.
If the pilots were shot at while they parachuted down expect those who did that to pay a heavy price for their ‘victory’.
And then there’s the rescue helicopter that was supposedly shot down also.
If you remember, there were stories in the news a few weeks ago about Russian aircraft violating Turkey's airspace. Turkey issued a strong warning at the time, and the stories disappeared for a while.
I don't think Turkey had any obligation to warn them again.
... the Turks are obligated to attempt to force the offending aircraft out of their airspace.
How do you do that?