Russian peacekeepers in Turkey this is a pure fantasy mate. Turks supported Chechen islamists because Russia was on verge of existence. They're nto gonna do anything like this when a country is strong.
It depends on how bad things get. If the UN has to create a mission you can guarantee Russians will be in it. Turks support terrorists, yeah I got it. Turkey isn't strong and growing weaker by the day economically which eventually effects military.
if Erdogan prepared coup himself then sudden rapprochement with Russia would be not grounded in anything. His grudge with US neither. As for economy Russia doesnt need to help with money, pledging in solution political issues for countries which own Turkey's loans can do miracles.
Russia did pledge couple of billions as credits for nuclear power plants and S-400
Turkey's loans are leveraged on the back of European loans of which they can't pay back, thus making Turkey's loans worthless. Credit was offered for half of S-400 before the lira collapsed, it has been withdrawn and a down payment was required for further financing talks still in negotiations. The nuclear power plant is majority owned by Rusatom, it is not credit but ownership.