I guess that putsch and assassination attempt was the driving factor of Turkey turning.
We might forget that, but back in 2015, Turkey was really at the edge of war with Russia.
In 2014 they overthrew the elected leader of the Ukraine because he wasn't behaving and doing what they demanded... the bastard was interested in the Ukraine and the Ukrainian people and wouldn't follow instructions, so the US got rid of him... a year later Erdogan obviously strayed from the clear and obvious path of being their performing monkey in the region to literally bait the bear... but someone screwed up and he held power and realised his position as far as they were concerned was to be their bitch and do as they instructed even at the expense of Turkeys interests and the Turkish people.
Has it made him a better leader for Turkey... was the conflict with Russia really Turkeys conflict or were they just following instructions from Washington that wanted that conflict with Russia.
Lots of people in the west want him to go because now he is interested in Turkey and the Turkish people instead of just being cannon fodder meat sheild material for the US and its drive to destroy any opposition... right now it is Russia, next it will be China... then probably India... there will always be some country they see as a threat... despite those countries not interfering in their elections or murdering their citizens for fun or for oil...
I don't particularly like his choices to help ISIS in Syria, but I understand the US thinking of helping an enemy to fight a greater enemy... even though that is incredibly stupid and very likely to bite you in the arse eventually... by the time he stopped listening to the US on such matters (2015) it was too late to change tack... I am sure he would prefer Assad as a neighbour than Syrian Kurds, but that option is no longer available...
Turkey is far too strategic a country, and its demands were ostensibly reasonable.
Reasonable demands have nothing to do with it... all Russia wants is to be treated with respect, but instead the west tries to go into meetings from a position of power or strength to bully or threaten Russia to get what they want so they can ignore Russian views or interests...
It will be resolved behind closed doors, its just a matter of time.
I hope it is. That wall/fence 1,300km long is going to be very very expensive and they wont have any old shit to give you to pump up your military so it is going to have to be even more new expensive shit they will have to make to pass on to you to man those walls.
Once you join Russia will shift you from neutral neighbour to hostile enemy and rubles for trade is coming in all goods and services... so that will close up trade relations between your countries. Russia will move some military forces there, but eventually they will revert to the cheaper option of ballistic and cruise missiles with tactical nuclear warheads to man the walls.
I am sure the west will compensate Finland and Sweden for the lost trade, like they didn't with Ukraine and Georgia.